LS327/327 (19165628 Base) Long Block Specifications

GM PERFORMANCE

PARTS

GENERAL MOTORS SERVICE PARTS OPERATIONS

6200 Grand Pointe Drive, Grand Blanc, MI 48439

LS327/327 (19165628 Base) Long Block Specifications

Specifications Part Number 19170486

Thank you for choosing GM Performance Parts as your high performance source. GM Performance Parts is committed to providing proven, innovative performance technology that is truly.... more than just power. GM Performance Parts are engineered, developed and tested to exceed your expectations for fit and function. Please refer to our catalog for the GM Performance Parts Authorized Center nearest you or visit our website at .

This publication provides general information on components and procedures which may be useful when installing or servicing an LS327/327 engine. Please read this entire publication before starting work. Also, please verify that all of the components listed in the Package Contents section below were shipped in the kit.

The information below is divided into the following sections: package contents, component information, LS327/327 engine specifications, additional parts that you may need to purchase, torque specifications, and a service parts list.

The LS327/327 engine incorporates modern technology in a package that can be installed in applications where LS design small block GM V-8's were originally used. This complete engine is assembled using brand new, premium quality components. Due to the wide variety of vehicles in which an LS327/327 engine can be installed, some procedures and recommendations may not apply to specific applications.

The LS327/327 engine is manufactured on current production tooling; consequently you may encounter dissimilarities between the LS327/327 engine assembly and previous versions of the LS design small block GM V-8. In general, items such as motor mounts, accessory drives, exhaust manifolds, etc. can be transferred to an LS327/327 when it is installed in a vehicle originally equipped with an LS design small block GM V-8 engine. However, as noted in the following sections, there may be minor differences between an LS327/327 engine and an older LS design small block GM V-8 engine. These differences may require modifications or additional components not included with the LS327/327 engine. When installing an LS327/327 engine in a vehicle not originally equipped with an LS design small block GM V-8, it may be necessary to adapt or fabricate various components for the cooling, fuel, electrical, and exhaust systems.

It is not the intent of these specifications to replace the comprehensive and detailed service practices explained in the GM service manuals.

For information about warranty coverage, please contact your local GM Performance Parts dealer.

Observe all safety precautions and warnings in the service manuals when installing an LS327/327 engine in any vehicle. Wear eye protection and appropriate protective clothing. When working under or around the vehicle support it securely with jackstands. Use only the proper tools. Exercise extreme caution when working with flammable, corrosive, and hazardous liquids and materials. Some procedures require special equipment and skills. If you do not have the appropriate training, expertise, and tools to perform any part of this conversion safely, this work should be done by a professional.

TITLE LS327/327 (19165628 Base) Long Block Specifications IR 07AU08 PART NO. 19170486

ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11 WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.

TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.

DATE

REVISION

07AU08 Initial Release - Rusty Sampsel

1 30 PAGE

OF

AUTH

GM PERFORMANCE

PARTS

GENERAL MOTORS SERVICE PARTS OPERATIONS

6200 Grand Pointe Drive, Grand Blanc, MI 48439

Legal and Emissions Information This publication is intended to provide information about the LS327/327 engine and related components. This manual also describes procedures and modifications that may be useful during the installation of an LS327/ 327 engine. It is not intended to replace the comprehensive service manuals and parts catalogs which cover General Motors engines and components. Rather, it is designed to provide supplemental information in areas of interest to "do-it-yourself" enthusiasts and mechanics.

This publication pertains to engines and vehicles which are used off the public highways except where specifically noted otherwise. Federal law restricts the removal of any part of a federally required emission control system on motor vehicles. Further, many states have enacted laws which prohibit tampering with or modifying any required emission or noise control system. Vehicles which are not operated on public highways are generally exempt from most regulations, as are some special interest and pre-emission vehicles. The reader is strongly urged to check all applicable local and state laws.

Many of the parts described or listed in this manual are merchandised for off-highway application only, and are tagged with the "Special Parts Notice" reproduced here:

Special Parts Notice This part has been specifically designed for Off-Highway application only. Since the installation of this part may either impair your vehicle's emission control performance or be uncertified under current Motor Vehicle Safety Standards, it should not be installed in a vehicle used on any street or highway. Additionally, any such application could adversely affect the warranty coverage of such an on-street or highway vehicle.

The information contained in this publication is presented without any warranty. All the risk for its use is entirely assumed by the user. Specific component design, mechanical procedures, and the qualifications of individual readers are beyond the control of the publisher, and therefore the publisher disclaims all liability incurred in connection with the use of the information provided in this publication.

Chevrolet, Chevy, the Chevrolet Bow Tie Emblem, General Motors, and GM are all registered trademarks of the General Motors Corporation.

Package contents:

Item Description

1

Engine Assembly

2

Instructions

Quantity 1

1

GM Part Number 19165542

19170486

TITLE LS327/327 (19165628 Base) Long Block Specifications IR 07AU08 PART NO. 19170486

ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11 WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.

TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.

DATE

REVISION

2 30 PAGE

OF

AUTH

GM PERFORMANCE

PARTS

GENERAL MOTORS SERVICE PARTS OPERATIONS

6200 Grand Pointe Drive, Grand Blanc, MI 48439

LS327/327 Engine Torque Specifications:

Specification

Metric

English

Camshaft Position (CMP) Sensor Bolt ........................................................................... 25 N?m ............ 18 lb ft

Camshaft Retainer Bolt - Hex Head Bolt ........................................................................ 25 N?m ............ 18 lb ft

Camshaft Retainer Bolt - TORX? Head Bolt .................................................................. 15 N?m ............ 11 lb ft

Camshaft Sprocket Bolts ................................................................................................ 35 N?m ............ 26 lb ft

Connecting Rod Bolts - First Pass ................................................................................. 20 N?m ............ 15 lb ft

Connecting Rod Bolts - Final Pass ........................................................................................... 85 degrees

Coolant Temperature Sensor ........................................................................................... 20 N?m ............ 15 lb ft

Crankshaft Balancer Bolt - Installation Pass - to Ensure the Balancer is Completely Installed ...... 330 N?m .......... 240 lb ft Crankshaft Balancer Bolt - First Pass - Install a NEW Bolt After the Installation Pass and Tighten as Described in the

First and Final Passes ............................................................................................... 50 N?m ............ 37 lb ft

Crankshaft Balancer Bolt - Final Pass .................................................................................... 140 degrees

Crankshaft Bearing Cap M8 Bolts ................................................................................... 25 N?m ............ 18 lb ft

Crankshaft Bearing Cap M10 Bolts - First Pass in Sequence ....................................... 20 N?m ............ 15 lb ft

Crankshaft Bearing Cap M10 Bolts - Final Pass in Sequence ................................................ 80 degrees

Crankshaft Bearing Cap M10 Studs - First Pass in Sequence ...................................... 20 N?m ............ 15 lb ft

Crankshaft Bearing Cap M10 Studs - Final Pass in Sequence ............................................... 51 degrees

Crankshaft Oil Deflector Nut ........................................................................................... 25 N?m ............ 18 lb ft

Crankshaft Position (CKP) Sensor Bolt .......................................................................... 25 N?m ............ 18 lb ft

Crossbar Bolt .................................................................................................................. 100 N?m ........... 74 lb ft

Cylinder Head M8 Bolts - in Sequence ........................................................................... 30 N?m ............ 22 lb ft

Cylinder Head M11 Bolts - First Pass in Sequence ....................................................... 30 N?m ............ 22 lb ft

Cylinder Head M11 Bolts - Second Pass in Sequence ............................................................ 90 degrees

Cylinder Head M11 Bolts - Final Pass in Sequence ................................................................ 70 degrees

Cylinder Head Coolant Plug ............................................................................................ 20 N?m ............ 15 lb ft

Drive Belt Idler Pulley Bolt .............................................................................................. 50 N?m ............ 37 lb ft

Drive Belt Tensioner Bolt ................................................................................................. 50 N?m ............ 37 lb ft

Engine Block Coolant Drain Hole Plug ........................................................................... 60 N?m ............ 44 lb ft

Engine Block Coolant Heater .......................................................................................... 50 N?m ............ 37 lb ft

Engine Block Oil Gallery Plugs ....................................................................................... 60 N?m ............ 44 lb ft

Engine Coolant Air Bleed Pipe and Cover Bolts ............................................................. 12 N?m ........... 106 lb in Engine Harness Ground Bolt - Right Rear ...................................................................... 16 N?m ............ 12 lb ft

Engine Harness Ground Bolt-to-Block ............................................................................ 25 N?m ............ 18 lb ft

Engine Mount Bolt ........................................................................................................... 50 N?m ............ 37 lb ft

Engine Mount Bracket Through Bolt ............................................................................... 75 N?m ............ 55 lb ft

Engine Mount-to-Engine Mount Bracket Bolt ................................................................. 65 N?m ............ 50 lb ft

Flex Plate/Rotor Bolts .................................................................................................... 100 N?m ........... 74 lb ft

Flywheel Bolts - First Pass ............................................................................................. 20 N?m ............ 15 lb ft

Flywheel Bolts - Second Pass ........................................................................................ 50 N?m ............ 37 lb ft

Flywheel Bolts - Final Pass ........................................................................................... 100 N?m ........... 74 lb ft

Front Cover Bolts ............................................................................................................. 25 N?m ............ 18 lb ft

Fuel Injection Fuel Rail Bolts .......................................................................................... 10 N?m ............ 89 lb in

TITLE LS327/327 (19165628 Base) Long Block Specifications IR 07AU08 PART NO. 19170486

ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11 WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.

TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.

DATE

REVISION

3 30 PAGE

OF

AUTH

GM PERFORMANCE

PARTS

GENERAL MOTORS SERVICE PARTS OPERATIONS

6200 Grand Pointe Drive, Grand Blanc, MI 48439

Specification

Metric

English

Fuel Rail Cover Bolt .......................................................................................................... 9 N?m ............. 80 lb in

Fuel Rail Crossover Tube Bolts ....................................................................................... 3.8 N?m ............ 34 lb in

Fuel Rail Stop Bracket Bolt ............................................................................................ 50 N?m ............ 37 lb ft

Generator Bracket Bolt ................................................................................................... 50 N?m ............ 37 lb ft

Generator Cable Nut ......................................................................................................... 9 N?m ............. 80 lb in

Ignition Coil Bracket-to-Valve Rocker Arm Cover Stud .................................................. 12 N?m ........... 106 lb in Ignition Coil-to-Bracket Bolts .......................................................................................... 10 N?m ............ 89 lb in

Intake Manifold Bolts - First Pass in Sequence .............................................................. 5 N?m ............. 44 lb in

Intake Manifold Bolts - Final Pass in Sequence ............................................................ 10 N?m ............ 89 lb in

Intake Manifold Sight Shield Bolt .................................................................................... 10 N?m ............ 89 lb in

Intake Manifold Sight Shield Retainer Bolt ...................................................................... 5 N?m ............. 44 lb in

Intake Manifold Wiring Harness Stud ............................................................................. 10 N?m ............ 89 lb in

Knock Sensors ................................................................................................................ 20 N?m ............ 15 lb ft

Oil Filter ........................................................................................................................... 30 N?m ............ 22 lb ft

Oil Filter Fitting ............................................................................................................... 55 N?m ............ 40 lb ft

Oil Level Indicator Tube Bolt ........................................................................................... 25 N?m ............ 18 lb ft

Oil Level Sensor .............................................................................................................. 13 N?m ........... 115 lb in Oil Pan Baffle Bolts ......................................................................................................... 12 N?m ........... 106 lb in Oil Pan Closeout Cover Bolt - Left Side .......................................................................... 12 N?m ........... 106 lb in Oil Pan Closeout Cover Bolt - Right Side ....................................................................... 12 N?m ........... 106 lb in Oil Pan Cover Bolts ......................................................................................................... 12 N?m ........... 106 lb in Oil Pan Drain Plug ........................................................................................................... 25 N?m ............ 18 lb ft

Oil Pan M6 Bolts - Oil Pan-to-Rear Housing .................................................................. 12 N?m ........... 106 lb in Oil Pan M8 Bolts - Oil Pan-to-Engine Block and Oil Pan-to-Front Cover ...................... 25 N?m ............ 18 lb ft

Oil Pressure Sensor ........................................................................................................ 35 N?m ............ 26 lb ft

Oil Pump Cover Bolts ...................................................................................................... 12 N?m ........... 106 lb in Oil Pump Relief Valve Plug ............................................................................................. 12 N?m ........... 106 lb in Oil Pump Screen Nuts .................................................................................................... 25 N?m ............ 18 lb ft

Oil Pump Screen-to-Oil Pump Bolt ................................................................................. 12 N?m ........... 106 lb in Oil Pump-to-Engine Block Bolts ..................................................................................... 25 N?m ............ 18 lb ft

Rear Oil Seal Housing Bolts ........................................................................................... 30 N?m ............ 22 lb ft

Spark Plugs ..................................................................................................................... 15 N?m ............ 11 lb ft

Throttle Body Nuts .......................................................................................................... 10 N?m ............ 89 lb in

Throttle Body Studs .......................................................................................................... 6 N?m ............. 53 lb in

Torque Converter Bolt - 4L60-E/4L65-E Transmissions .................................................. 63 N?m ............ 47 lb ft

Torque Converter Bolt - 4L80-E/4L85-E Transmissions .................................................. 60 N?m ............ 44 lb ft

Valley Cover Bolts ........................................................................................................... 25 N?m ............ 18 lb ft

Valve Lifter Guide Bolts ................................................................................................... 12 N?m ........... 106 lb in Valve Rocker Arm Bolts .................................................................................................. 30 N?m ............ 22 lb ft

Valve Rocker Arm Cover Bolts ........................................................................................ 12 N?m ........... 106 lb in Water Inlet Housing Bolts ............................................................................................... 15 N?m ............ 11 lb ft

Water Pump Bolts - First Pass ....................................................................................... 15 N?m ............ 11 lb ft

Water Pump Bolts - Final Pass ...................................................................................... 30 N?m ............ 22 lb ft

TITLE LS327/327 (19165628 Base) Long Block Specifications IR 07AU08 PART NO. 19170486

ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11 WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.

TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.

DATE

REVISION

4 30 PAGE

OF

AUTH

GM PERFORMANCE

PARTS

GENERAL MOTORS SERVICE PARTS OPERATIONS

6200 Grand Pointe Drive, Grand Blanc, MI 48439

Component Information: The LS327/327 crate engine uses stock 5.3 LM7 components except as noted below. Additional service information not included in this document can be found from your GM Performance Parts dealer under the LM7 RPO (19992007 Chevrolet Silverado) for all components except those noted below.

Cylinder Heads: The LS327/327 engine has aluminum cathedral port cylinder heads. These heads were used on production 5.3 engines such as regular production option (RPO) LM7 and L59. These heads use 1.89" intake valves and 1.55" exhaust valves. Chamber size is 61.15cc +/- 1.0cc

Camshaft: The LS327/327 uses a performance hydraulic roller camshaft. Valve lift using 1.7:1 rocker arms is .467 intake / .479 exhaust and duration @.050 in. is 196 degrees intake / 201 degrees exhaust. LSA is 116 degrees

Start-up and Break-in Procedures Safety first. If the vehicle is on the ground, be sure the emergency brake is set, the wheels are chocked and the car cannot fall into gear. Verify everything is installed properly and nothing was missed.

1. This engine assembly needs to be filled with oil. After installing the engine, ensure the crankcase has been filled with the appropriate motor oil to the recommended oil fill level on the dipstick. The LS327/327 crate engine requires a special oil meeting GM Standard GM4718M (this will be specified on the oil label). Mobil 1 is one such recommended oil. Other oils meeting this standard may be identified as synthetic. However, not all synthetic oils will meet this GM standard. Look for and use only an oil that meets GM Standard GM4718M. Also check and fill as required any other necessary fluids such as coolant, power steering fluid, etc.

2. The engine should be primed with oil before starting. Install an oil pressure gauge (the existing oil pressure sensor location at the upper rear of the engine may be used) and disconnect the engine control system (removing power from the engine control module is generally recommended, but check your engine control system information for additional details). Note: Disconnecting only ignition or fuel injector connectors is not recommended ? make sure the control system will not provide ignition or fuel to the engine.

3. Once the engine control system has been disconnected, crank the engine using the starter for 10 seconds and check for oil pressure. If no pressure is indicated, wait 30 seconds and crank again for 10 seconds. Repeat this process until oil pressure is indicated on the gauge.

4. Reconnect the engine control system. Start the engine and listen for any unusual noises. If no unusual noises are noted, run the engine at approximately 1000 RPM until normal operating temperature is reached.

5. When possible, you should always allow the engine to warm up prior to driving. It is a good practice to allow the oil sump and water temperature to reach 180?F before towing heavy loads or performing hard acceleration runs.

6. The engine should be driven at varying loads and conditions for the first 30 miles or one hour without wide open throttle (WOT) or sustained high RPM accelerations.

7. Run five or six medium throttle (50%) accelerations to about 4000 RPM and back to idle (0% throttle) in gear.

8. Run two or three hard throttle (WOT 100%) accelerations to about 4000 RPM and back to idle (0% throttle) in gear.

9. Change the oil and filter. Replace the oil per the specification in step 1, and replace the filter with a new PF59 AC Delco oil filter. Inspect the oil and the oil filter for any foreign particles to ensure that the engine is functioning properly.

10. Drive the next 500 miles (12 to 15 engine hours) under normal conditions. Do not run the engine at its maximum rated engine speed. Also, do not expose the engine to extended periods of high load.

11. Change the oil and filter. Again, inspect the oil and oil filter for any foreign particles to ensure that the engine is functioning properly.

TITLE LS327/327 (19165628 Base) Long Block Specifications IR 07AU08 PART NO. 19170486

ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11 WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.

TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.

DATE

REVISION

5 30 PAGE

OF

AUTH

GM PERFORMANCE

PARTS

GENERAL MOTORS SERVICE PARTS OPERATIONS

6200 Grand Pointe Drive, Grand Blanc, MI 48439

LS327/327 Engine Specifications: Displacement: ........................................................................ 323 cubic inches (5.3 L) Bore x Stroke: ........................................................................ 3.78 inch x 3.62 inch Compression .......................................................................... 9.5:1 Block: ..................................................................................... Cast iron, six-bolt cross bolted mains Cylinder Head: ....................................................................... Cast aluminum, cathedral port

Valve Diameter (Intake/Exhaust): ...................................... 1.89"/1.55" Chamber Volume: .................................................................. 61cc Crankshaft: ............................................................................. Nodular iron, 1 piece rear seal Connecting Rods: .................................................................. Steel, powdered metal Pistons: .................................................................................. Hypereutectic aluminum Rings: ..................................................................................... Moly coated steel Camshaft: ............................................................................... Hydraulic roller tappet

Lift: ...................................................................................... .467" intake, .479" exhaust Duration: ............................................................................. 196? intake, 201? exhaust @.050" tappet lift Centerline: ........................................................................... 115? ATDC intake, 117? BTDC exhaust Rocker Arm Ratio: ................................................................. 1.7:1 Oil Pan: .................................................................................. 6.0-quart (with filter) Oil Pressure (Minimum, with hot oil): ................................... 6 psig @ 1000 RPM ............................................................................................... 18 psig @ 2000 RPM ............................................................................................... 24 psig @ 4000 RPM Recommended Oil: ................................................................ 5w30 GM Standard GM4718M motor oil (see ............................................................................................... Start- up Break-in procedures above) Oil Filter: ................................................................................ AC Delco part # PF59 Valve Lash: ............................................................................ Torque to spec Fuel: ....................................................................................... Regular unleaded - 87 (R+M/2) Maximum Engine Speed: ...................................................... 6000 RPM Spark Plugs: .......................................................................... AC Delco part # 41-985 Spark Plug Gap: .................................................................... .040" Firing Order: ........................................................................... 1-8-7-2-6-5-4-3

Information may vary with application. All specifications listed are based on the latest production information available at the time of printing.

Additional parts that may be needed: Auto Transmission Flexplate: The LS327/327 does not come with a flywheel or flexplate. P/N 12606620 Flexplate can be used for all automatic transmissions built from 1998 and newer (except 4L80 or 4L85E ? See Flexplate Spacer below) Flexplate bolts used to fasten to the crankshaft are 12553332 (6 required)

TITLE LS327/327 (19165628 Base) Long Block Specifications IR 07AU08 PART NO. 19170486

ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11 WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.

TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.

DATE

REVISION

6 30 PAGE

OF

AUTH

GM PERFORMANCE

PARTS

GENERAL MOTORS SERVICE PARTS OPERATIONS

6200 Grand Pointe Drive, Grand Blanc, MI 48439

Flexplate Spacer (Required when using 1997 or older Auto Trans or any year 4L80E or 4L85E) The LS327/327 engine has the same bell housing pattern as the older Chevrolet engines. However, the LS design small block crankshaft flange is 10mm shorter in relation to the end of the bell housing flange. If using a small block automatic transmission built before 1997, there will be a 10mm gap between the crankshaft and torque converter when the bell housing is bolted to the block. This will require a flexplate spacer to adapt older small block automatic transmissions to the LS327/327 engine. A list of required parts is shown below:

Part Number 12563532 12563533 12551367 11589040

Description Flexplate Spacer Flexplate to Crank Bolt Flexplate Flexplate to T/Conv Bolt

Quantity Required 1 6 1

3 or 6

Manual Transmission Flywheel: For Manual Transmissions use Flywheel 12576652. Bolts used to fasten to the crankshaft are 11569956.

Pilot Bearing: You must install a pilot bearing in the rear of the crankshaft if the engine will be used with a manual transmission. The pilot bearing aligns the transmission input shaft with the crankshaft centerline. A worn or misaligned pilot bearing can cause shifting problems and rapid clutch wear. A roller pilot bearing Part number 12557583 is recommended for this engine. This heavy-duty bearing adds an extra margin of reliability to a high performance drivetrain.

Starter: The LS327/327 engine does not include a starter. P/N 10465385 will fit this engine. All LS starters require special shouldered bolts. One of each part number (11588456 and 12561848) starter bolt will be required.

Oil Pan / Dipstick:

The LS327/327 engine includes an oil pan part number 12579273 which is the same pan as the production 5.3 LM7 Truck. This is a 5.5 quart oil pan. The LS327/327 engine does not come with a dipstick or tube. Below are suggested parts that can be used:

12584738 - Tube, Oil Level Indicator 12603506 - Indicator, Oil Level 11588736 - Bolt, Oil Level Tube to Cylinder Head

The LS327/327 production oil pan may not fit some applications. GM Performance Parts offers an oil pan kit 19212593 that has a more rearward rear sump 5.5 quart oil pan. The kit includes a pan, pick-up tube, gasket, dipstick, dipstick tube, oil deflector, and bolts. See your local GM Performance Parts dealer or visit our website at .

Intake Manifold (Carbureted): The LS327/327 does not include an intake manifold. For carbureted applications, P/N 88958675 4-Barrel intake manifold allows you to install a four-barrel carburetor on any LS series engine with cathedral ports. This is a cast aluminum open-plenum intake manifold that accepts a 4150-style square-bore carburetor.

Carburetor / Air Cleaner: A 770 cfm Holley four-barrel carburetor with vacuum operated secondaries and electric choke is recommended for the LS327/327 engine. GM Performance Parts has a 770 cfm Holley carburetor part number 19170093 and with vacuum secondaries.

TITLE LS327/327 (19165628 Base) Long Block Specifications IR 07AU08 PART NO. 19170486

ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11 WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.

TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.

DATE

REVISION

7 30 PAGE

OF

AUTH

GM PERFORMANCE

PARTS

GENERAL MOTORS SERVICE PARTS OPERATIONS

6200 Grand Pointe Drive, Grand Blanc, MI 48439

A foam or paper element, low restriction air cleaner should be used to protect the engine from excessive wear and diffuse the air entering the carburetor. The fuel mixture distribution can be upset if no diffuser is used, causing poor power and misfiring at high engine speeds. Always check for adequate hood clearance when installing a new air cleaner. GM Performance Parts has two chrome 14" air cleaner assemblies for single 4 barrel engines. 12342071 is the Classic design and 123420280 is the high performance design.

Fuel Pump (Carbureted): LS 327/327 engines do not have a mechanical fuel pump boss on the block A front distributor drive cover kit P/N 88958679 can be installed that does have provisions for a mechanical fuel pump. The fuel system must be capable of supplying adequate fuel volume at a minimum of 6 psi pressure when the engine is operating at wide open throttle (WOT). A high volume in-line electric fuel pump is available from GM Performance Parts Part number 25115899. This heavy duty pump flows 72 gallons per hour at 6-8 psi outlet pressure.

Ignition system: The LS327/327 is equipped with a 24x crankshaft reluctor and crank sensor above the starter mounting boss on the side of the block. It also has a 1X camshaft sensor at the rear of the engine valley cover. The LS327/327 does not include any other ignition system components. If using an aftermarket ignition system such as MSD's 6010 or something similar, be sure it is compatible with a 24x crankshaft sensor signal. If using the P/N 88958679 front distributor drive cover kit (see above), it has provisions for a conventional distributor. An instruction included with the cover kit has more details. NOTE: Neither of the GM Performance Parts FEAD kits will fit when using the 88958679 Front Distributor Drive Cover Kit (see below).

Headers: The LS327/327 engine can be equipped with a header exhaust system for maximum performance in applications where a nonproduction exhaust system is legal. For street performance and limited competition applications, the recommended header configuration is 1 3/4" diameter primary pipes, 32 to 36 inches long, with 3" diameter collectors. Use 2 1/2" diameter tailpipes with a balance tube ("H" pipe) and low restriction mufflers.

Front End Accessory Drive (FEAD) Brackets: Two Front End Accessory Drive (FEAD) Kits are available from GM Performance Parts to fit the LS327/327 engine. P/N 19155066 is based off the 2006 Cadillac CTS-V can be described as "tall and narrow" P/N 19155067 is based off the 2006 Corvette and can be described as "low and wide" Both kits include air conditioning components. In either case, the harmonic balancer and water pump will have to be changed to use the 19155066 or 19155067 FEAD kit because of offset differences. These FEAD kits do not include a harmonic balancer or water pump. Additional parts needed will be your choice of 12560115 or 12598831 harmonic balancer and also P/N 89018052 water pump.

NOTE: If installing this engine in a light duty truck application that originally used an LS design engine, you will be able to use the original accessories from the vehicle and also use the water pump and harmonic balancer that is included with this engine. Please see your GM Performance Parts dealer or visit us on the web at for dimensions and additional details.

NOTE 2: Neither of the GM Performance Parts FEAD kits will fit when using the 88958679 Front Distributor Drive Cover Kit (see above).

Rocker Covers: The LS327/327 engine comes equipped with cast aluminum, center hold-down bolt rocker covers. A wide variety of valve cover choices are available at your GM Performance Parts dealer or visit us on the web at .

TITLE LS327/327 (19165628 Base) Long Block Specifications IR 07AU08 PART NO. 19170486

ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11 WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.

TO BE UNITIZED IN ACCORDANCE WITH GMSPO SPECIFICATIONS.

DATE

REVISION

8 30 PAGE

OF

AUTH

 ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download