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max69
New User
| Posts: 3
| Joined: 11/08
Posted: 11/09/08
07:26 AM
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I have a 77 Trans Am motor, factory low compression. Am I better off with a 72 cc head to boost compression or the larger 96cc and up? I would like to be about 9.5 to 1. Thanks, Max
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Posted: 11/09/08
07:37 AM
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The 72CC heads with a flat top piston will give you a 10:1CR which is too much for pump gas so I recomend a head with a 89CC chamber which will put you around 9-9.5:1CR.
professional hi-performance engine builder
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Posted: 11/09/08
09:23 AM
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Another approach is to use a 72cc head with dished pistons (KB makes them). This produces 9.6:1 CR. Of course this would require considerably more work and $$ than just a head swap.
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