2008 OSS RULES

Pistons (340 cu. in.) – O.E.M. or cross reference to original equipment. Pistons must duplicate original equipment, position of ring land, distance of skirt, position of pin. Press or floating pin is optional. Flat top only part # 3690825 is acceptable or N.S.C.A. approved 4.c.c. min valve relief. ................
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