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So you want to figure out your compression ratio... ratio's are simple math... I've always considered them something I can do in my head... Here's the formula:

Swept volume + Gasket thickness + Head volume = v1

Gasket volume + Head cc volume + any dish volume = v2

v1/v2=compression ratio

Sounds simple don't it... well it is... just in case tho..... "/" means divide

So how do you determine swept volume, gasket thickness, head cc volume and dish volume....

First off use standard measurement values, if your working with cc's all values should be in cc's. Likewise, if your using inches.

Next, look up the spec's for your engine... also note if you have flat top pistons or dished. If you have flat top pistons, no value is needed to be applied.

Lastly, or if your like me you'll go there next.... head to http://www.geocities.com/MotorCity/Track/6997/compression.html

The information is nicely explained. Give it a shot, if you have any problems, let me know and I'll be happy to help you out. Of course, I will need to know a few things. Like your block casting number, head casting number, head gasket used, and if the head was shaved... how much material was removed. The value should be a thickness.

good luck, and let me know what compression ratio you have.

Dennis
 
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