First off I’m not trying to get into a pi$$ing contest with this post, but I do have a couple of pointed questions.

First off have you really measured anything or are you going off information you got off various web sites to get your information from? The reason I’m asking is you reply to the question on the real chamber volume of the 76cc heads you were looking at….. “I measured 76cc on the heads +/- 2” . I’ll admit I haven’t seen everything but on all the unmilled OE Chevy heads I have CCed over the years have always been AT LEAST 2 to 6 CCs (or more) larger than the factory claimed.

Most flat top pistons also have valve reliefs cut into them and in some cases have a bevel around the outer edge…..have you measured or gotten that volume form the piston manufacture?

Have you measured how far down in the cylinder the piston actually is at TDC or are you just assuming it’s a 0 deck height? If the piston is down that volume also needs to be included in your calculations.

If you haven’t gone to the trouble of actually taking these measurements chances are your calculations for static compression you’ve figured is going to be on the high side……which is actually good news for you. Not taking the measurements reduces you to just taking a SWAG at where you will be.

Push come to shove you can get head gaskets in various thicknesses to drop the compression. We’re currently planning on .085 compressed thickness gaskets on a numbers matching DZ 302 to get compression down a streetable level.

The same would hold true for the 327 your building (assuming your real static compression ratio is what you claim). The thicker gaskets usually play hell with the quench and will drop potential power but at least the car will be drivable. Now of course you have to figure an additional $200 for the gaskets in addition to what you pay for the heads and having them rebuilt. So in the end what have you really saved by using OE heads?


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