Quote:
Originally Posted by 1969GPSJ
Nope, the 16 casting heads I have cc'd have been consistently right around 72 ccs (low end 68 ccs, high end 74 ccs, but the low end may have had been resurfaced). Pontiac was pretty good with the RAIII and HO "d" port chamber machining consistency. Post 1970 heads may have had larger chambers, but the '68 through '1970 open chamber high compression D port heads used on the performance 428s and 400s did not.
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This specific 428 engine has not previously been apart, so the finish of the head and block would be as they were when they left the factory. I may end up using the Copper gaskets from Butler or another source.
Again, this is a somewhat temporary answer to getting the car back on the road. I have not dealt with Cometic's MLS gaskets in the past - I just have not needed anything that specialized, and the Fel-Pros worked just fine. I am just wanting a little more gasket to reduce compression from the factory 10.5:1 to 10 or 9.7.