Thread: raising compression ratio via pistons...Attention Tech Inspector

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Okay , maybe I should just do the heads, and leave the dish pistons,bottom end alone. Let me ask you this. If I have 8.2 cr now, and I put a set of 1970 64cc chamber heads on it(I have a set of done heads), will I get much more out of it? Will I notice a difference verses using my 76cc heads?? I guess it will raise the cr about 1 point. I am not sure how much of a gain I will get doing this, and adding the cam and intake and headers.Neeed some more input. So far, I am gonna leave to he bottom end alone. Now, are my set of 64cc heads gonna do the trick? Also, the car came stock with an alum. intake q-jet. I have an adapter and a holley 650 I rebuilt, I took off the electronic q-jet. Do I need to get a new intake, or will the adapter work okay??

You should notice a definite increase in power, especially because of the better breathing heads and change of cam. Some of those smogger heads had pretty poor flow characteristics. If you use Vortec heads, you will have to use a new manifold as the bolt pattern is different. I am not a fan of adapters, so if you decide to use a different kind of head, I would get a new intake as well. The Edelbrock RPM manifold flows better than a stock GM aluminum manifold, and it would be money well spent.