How do you change the compression ratio in your car engine?

How do you change the compression ratio in your car engine?
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Answer :

I’m assuming that you want to lower the compession ratio to allow the use of lower octane fuel. The easiest way is to make a spacer the same shape as the head gasket and install it “sandwiched” between two gaskets. Remember to allow for the thickness of the second gasket when calculating how thick the shim stock should be.
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