A.S.A. APPROVED SPEC. ENGINE ,THIS IS AN EXTERNALLY BALANCED ENGINE ,SCHOENFELD HEADER NUMBER SCH155 WILL NOT FIT THE CYLINDER HEADS ON THIS ENGINE, YOU MUST USE SCH155VCM, PULLEY KIT SYSTEM USE JRP1004-S-CE-6500, 1-PIECE REAR MAIN,OIL PAN GASKET USE GMP10108676 OR FEL1886 OR OS34500R, THIS ENGINE IS INTENDED FOR RACING USE ONLY! THERE IS NO WARRANTY!