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.
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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