243's on 5.3
11-28-2007, 01:08 PM
#56
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I have a set of 243s in my basement collecting dust. Now tell me if im right: stock gasket size is .053" and the stock LM7 CC is 61cc. The LS2 heads are 65cc and the ratio of milling .006 equals 1cc on 243s. How far would I need to mill to get a 10.5-1 or 11-1 comp ratio? Could also use a flatter gasket like .041" to help with the smaller combustion chamber.
11-28-2007, 03:52 PM
#57
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i don't remember how far you can mill them before you have clearence issues. mine are milled .040 with stock gaskets and if i had to guess my cr should be between 10-10.5. so with a thinner gasket it should be easy to get where you want to be. it would take someone smarter and more precise than me to give you specs.
11-28-2007, 06:02 PM
#58
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i don't remember how far you can mill them before you have clearence issues. mine are milled .040 with stock gaskets and if i had to guess my cr should be between 10-10.5. so with a thinner gasket it should be easy to get where you want to be. it would take someone smarter and more precise than me to give you specs.
