Originally Posted by Paul
I'd have to go back and re-calculate... but I don't believe a 1.5 head (un-milled) on dished 7:6 to 1 pistons would yield 11:1. I think its closer to the 8.5 - 9 :1 range...
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That's what I have been going by:
http://www.opelgt.com/forums/13188-post4.html