they where on le3 lt4 heads with a felpro 1074 gasket .039 thick. Those heads had 58cc chambers and I was around 11.5-11.6. I guess some would depend on whats your deck height, combustion chambers of the heads, and if they been cut any. If you have like a le3 lt1 head with the 2.05 valves, your combustion chamber maybe smaller and might get you the 11.8-12.0 range.
