Any stock OEM cast iron cylinder head with a min. of 62 cc
chamber, must be straight plug. Any aftermarket cast iron cylinder head with a min. of 72 cc
chamber. Can run vortec heads but have to add 40lbs in front of firewall. Maximum.550 cam lift. Holley 4412 with factory specs only. No carb spacers allowed only a 1 inch adapter. Flat top pistons only, must use steel connecting rods, crankshafts can be steel but must be stock stroke. Full Roller Rockers are allowed. 362 cubic inch max.
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