I was going to buy new heads because I have to lower my compression ratio. The heads I have now have a 60cc combustion chamber and I need a 64cc chamber to get the compression ratio I want.

I saw that Fel-Pro sells copper shims to "return" shaved heads back to a pre-shaved condition. They are .020" at a 4.100" bore which equates to 4.25cc (exactly what I need). This lowers my compression ratio about half a point.

I have a couple questions:

1. Where do these shims go? Between the block and gasket or between the gasket and the head?

2. My heads have not been shaved so they will both move "out" and "up" approximately .014" (.020 X cos45º). Will this be a problem when mounting the lower intake?

Thanks for the help and if there is any reason why I should not do this, please let me know.
[addsig]