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its under 10:1. tsx is 10.5:1, and tsx and k20 cyl heads have the same cc volume. i believe i read that all the k heads have the same cc, of very close, so it would be the same as whatever the stck compression is pretty much
 

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Come on, someone on here has to know for sure. None of this reliable source stuff. Help the guy out; I wish I could.
 

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for those that have said that the chambers on the head is all the same in k series ...is the head gasket the same as well or is it different...i need to know this so i won' t order the wrong one when doing a k24/k20...i remember seeing that rsx is 86mm and k24's were 87 i think...
 
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