Small Block Chevy LS Cylinder Heads by Casting Number ...
Sm a ll Block Che vy LS Cylinde r He a ds by Cast ing N um be r
1 0 2 1 5 3 3 9 ? LS Sm all Block V8 1997 346, LS1, alum inum , 68cc cham bers
1 2 4 8 0 0 0 5 ? LS Sm all Block V8 2000 LS1, GTZ, alum inum , 38cc cham bers, 2.125/ 1.625 valves, angle plugs
1 2 5 5 6 7 4 3 ? LS Sm all Block V8 1999 325, 5.3L, alum inum , t ruck, van
1 2 5 5 8 8 0 6 ? LS Sm all Block V8 1997- 1998 346, LS1, alum inum , 68cc cham bers
1 2 5 5 9 8 5 3 ? LS Sm all Block V8 1999 346, LS1, alum inum , 68cc cham bers
1 2 5 5 9 8 6 2 ? LS Sm all Block V8 1999- 2000 alum inum , LS, 4.8 or 5.3L
1 2 5 5 9 8 9 5 ? LS Sm all Block V8 2000 325 ( 5.3L) alum inum
1 2 5 6 1 7 0 6 ? LS Sm all Block V8 2001- 2004 325 ( 5.3L) alum inum 1 2 5 6 1 8 7 3 ? LS Sm all Block V8 1999- 2001 364, 6.0L, LS, 71cc cham bers, cast iron
1 2 5 6 2 3 1 7 ? LS Sm all Block V8 2001- 2004 364, 6.0L, LS, 71cc cham bers, alum inum
1 2 5 6 4 2 4 1 ? LS Sm all Block V8 2000 346, LS1, alum inum , 68cc cham bers
1 2 5 6 4 2 4 3 ? LS Sm all Block V8 2001 346 ( 5.7L LS6) or 364 ( 6.0L LS2) , alum inum
1 2 5 7 2 0 3 5 ? LS Sm all Block V8 2001- 2004 364, 6.0L, LS, alum inum , 71cc cham bers
1 2 5 5 0 5 9 2 ? LS Sm all Block V8 1997- up 346, LS1
1 2 5 5 9 8 4 6 ? LS Sm all Block V8 1998- up 346, LS1
1 2 5 6 0 6 2 1 ? LS Sm all Block V8 1998- up 346, LS1
1 2 5 6 2 1 7 4 ? LS Sm all Block V8 1998- up 346, LS1
10106178 ? LT Sm all Block V8 1990 350, LT5, Corv et t e ZR1, DOHC 32- v alv e, alum inum , passenger side head
10106179 ? LT Sm all Block V8 1990 350, LT5, Corv et t e ZR1, DOHC 32- v alv e, alum inum , drivers side head
10125320 ? LT Sm all Block V8 1994- 1996 350, LT1, cast iron, Caprice 9C1 Police, I m pala SS, Cadillac Fleet wood, Buick Roadm ast er, rev erse flow cooling
10128374 ? LT Sm all Block V8 1992 350, LT1, 53cc cham bers, angle plugs, alum inum , reverse flow cooling, 175cc intake ports, 68cc exhaust ports
10174389 ? LT Sm all Block V8 1991- 1995 350, LT5, Corv et t e ZR1, DOHC 32- v alv e, driver side, alum inum
10174390 ? LT Sm all Block V8 1991- 1995 350, LT5, Corv et t e ZR1, DOHC 32- v alv e, passenger side, alum inum
10205245 ? LT Sm all Block V8 1993 350, LT1, alum inum , reverse flow cooling, 175cc int ake port s, 68cc exhaust port s
10207643 ? LT Sm all Block V8 1994- 1996 350, LT1, alum inum , reverse flow cooling, 175cc intake ports, 68cc exhaust ports
10208890 ? LT Sm all Block V8 1994- 1996 265, Baby LT1, L99, cast iron, reverse flow cooling
10225121 ? LT Sm all Block V8 1994- 1995 350, LT5, Corv et t e ZR1, DOHC 32- v alv e, drivers side, alum inum
10225122 ? LT Sm all Block V8 1995 350, LT5, Corv et t e ZR1, DOHC 32- v alv e, passenger side, alum inum
10239902 ? LT Sm all Block V8 1996 350, LT4, alum inum , reverse flow cooling, 195cc intake ports, 54cc cham ber, angle plugs
12529742 ? LT Sm all Block V8 1995- 1996 265, Baby LT1, L99, cast iron
12551561 ? LT Sm all Block V8 1996 350, LT1, alum inum , reverse flow cooling
12554290 ? LT Sm all Block V8 1994- 1996 350, LT1, Caprice 9C1 Police, I m pala SS, Cadillac Fleet wood, Buick Roadm ast er, reverse flow cooling
12554291 ? LT Sm all Block V8 1995- 1996 265, Baby LT1, L99, cast iron
12555690 ? LT Sm all Block V8 1996 350, LT4, alum inum , reverse flow cooling
14088526 ? LT Sm all Block V8 350, LT1, alum inum
Here's m ore reading t han you ever cared t o do on LS heads:
933 97 aluminum perimeter bolt 5.7 806 97-98 aluminum perimeter bolt 5.7 853 99-00 alum inum center bolt 5.7 241 01- 03 alum inum cent er bolt 5.7 ( som e lat e MY00 cars got 241 cast ings) 243 04 up LS6 alum inum cent er bolt 5.7 * * * These cast ings were also used around 05 in truck applications* * * 862 99 and up 4.8- 5.3 Truck heads 706 99 and up 4.8- 5.3 Truck heads 799 05 and up 4.8-5.3Truck heads * * * reportedly cam e on a few corvette's too* * * These are basically 243 Heads 873 99- 00 LQ4 6.0 I ron cent er bolt heads 317 01 and up LQ4 and LQ9 6.0 alum inum cent er bolt heads 035 01 - 04 LQ9 6.0 alum inum center bolt heads
Ev en m ore det ailed info:
Cast ing Num bers 241, 806, 853 Head: 1997+ LS1 5.7 Lit er Passenger Car Mat erial: Alum inim um Part Num ber: 12559806 ( 1997- 98) Cham bers = 69cc 12559853 (1999-00) 12564241 (2000-03) Com bust ion Cham ber Volum e: 66.67cc Com pression Rat io: 10.1: 1 I nt ake Port Volum e: 200cc Ex haust Port Volum e: 70cc I ntake Valve Diam eter: 2.00 inches Ex haust Valv e Diam et er: 1.55 inches
St ock Head Flow Num bers Cham ber 66.67 cc- - - - - - 0.100- - 0.200- - - 0.300- - - 0.400- - - 0.500- - - 0.550- - 0.600 I ntake 200 cc------------67----122-----178-----215-----219-----223---227 Ex haust 70 cc- - - - - - - - - - - - 52- - - - - 97- - - - - 133- - - - - 156- - - - - 170- - - - - 76- - - - 180
What you need to know: The st andard issue LS1 heads is best all- around head for t he st reet / st rip engines . A thorough porting and m illim g job plus a valve upgrade on these will really wake up your engine.The heads have undergone only m inor revisions since t heir introduction in 1997 , m ost notably a switch from perim eter to center valvcover bolt configurat ion for t he 1999 m odel year. Each st yle has it s own dedicat ed valvecovers and coilpacks m ounting apparatus.
Cast ing Num ber 243 Head: 2001 LS6 5.7 Lit er Passenger Car Mat erial: Alum inim um Part Num ber: 12564243 Com bust ion Cham ber Volum e: 64.45cc Com pression Rat io: 10.5: 1 I nt ake Port Volum e: 210cc Ex haust Port Volum e: 75cc I ntake Valve Diam eter: 2.00 inches Ex haust Valv e Diam et er: 1.55 inches
St ock Head Flow Num bers Cham ber 64.45 cc- - - - - - - 0.100- - - 0.200- - 0.300- - 0.400- - - 0.500- - - 0.550- - - 0.600 I ntake 210 cc------------62------126----184----224-----251----256----257 Ex haust 75 cc- - - - - - - - - - - - 57- - - - - - 108- - - - 143- - - - 163- - - - - 176- - - - 180- - - - 183
What you need to know: The LS6 cylinder heads is essent ially a t uned- up version of t he LS1 head. At 65cc, t he com bust ion cham ber is slight ly sm aller and m ore efficient t han t he LS1. The m ore efficient design shortens burn tim es and ultim ately m eans less ignition tim ing advance is required t o produce t he sam e power. And because less t im ing allows m ore efficient com bust ion, t he Ls6 heads allow t he engine t o produce m ore t orque. The exhaust port is a unique D- shape t hat im proves flow. LS6 heads are t he best choice only when all-out power is needed. Be prepared for a big price tag at the dealer or steep core charge from your head porter.
Cast ing Num ber 706 and 862 Head: 1999+ 4.8L / 5.3 Lit er Truck Mat erial: Alum inim um Part Num ber: 12559862 12561706 Com bust ion Cham ber Volum e: 61.15cc Com pression Rat io: 9.5: 1 I nt ake Port Volum e: 200cc Ex haust Port Volum e: 70cc I ntake Valve Diam eter: 1.89 inches Ex haust Valv e Diam et er: 1.55 inches
St ock Head Flow Num bers Cham ber 61.15 cc- - - - 0.100- - 0.200- - 0.300- - 0.400- - 0.500- - - 0.550- - - 0.600 I ntake 200 cc----------63 ---128----179-----210----218----221-----226 Ex haust 70 cc- - - - - - - - - - 54 - - 93 - - - - 121- - - - 145- - - - - 163- - - - 168- - - - 174
What you need to know: These sm all com bust ion cham ber t ruck heads offer no advant age over an LS1 head except the sm aller com bust ion cham ber. This along wit h m illing of t he deck surface will allow a slightly higher com pression ratio to be achieved. Because of the sm aller int ake valve inst alled in t hese heads a valve upgrade is pract ically m andat ory.
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