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It depends on what you are looking for. Most people just go with what is readily available. The Cometic is .051", the Mitsu MLS is .067, I believe stock is .042"(but I could be wrong), SCE make them a lot of different sizes.
On our cars, compression will lower roughly 1/10 of a point for every .010" increase in gasket thickness. So if you went with the Cometic, you compression would drop roughly to 7.7:1.
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