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i ur using a stock 400 block i wouldnt go as larger as a 227 head. if 500-550 hp is ur goal a set of afr comp 195's or 210's will be fine. going with a smaller head will increase ur low end and mid range which is critical in drag racing. to large of a head will make the launch and mid track seem lazy. 227 heads are made for engines make 650 hp and up. i can tell u right now that ive seen 195 comps on a 427 that worked extremely well in a bracket car. full bodied stock weight 68 camaro 10.50's on a 9" tire. if u supply me with all engine spec i can further help u in choosing the right head for ur app. info needed, cam profile if u have one,compression, cu in. manifold, header size, rear gear, trans, car weight, et goal, hp goal,etc..etc...etc..
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TMR performance
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