I'm looking to reduce the compression in my street 440/493. I'm not ready to pull the engine to swap pistons or have them cut.
Currently I'm at 10.73 to one. 440 block, .030 over with Ross flat tops sitting .017 in the hole. .039 head gasket resulting in a .056 quench distance using the 84 cc Edelbrock closed chamber RPM heads. I am dealing with detonation at WOT due to the compression and the 185-193 cranking Comp. 292/509 cam installed straight up.
I'm already planning on a cam swap, a bigger cam with a later intake closing like the Comp XE294H. This cam with my 1.6 rockers gets me .553/.558 lift.
I've read about the effects of losing quench by going to a thicker gasket, but since I am already at .056, it would seem that there probably isn't as much going on as compared to being at .035-.045. I am looking at using a "Flatout" gasket I saw listed. It is a .064 rubber coated copper gasket. I've ran Cometics before but those are pretty spendy. The Flatouts are $180 a pair, Cometics are $300. My question is do these Flatouts need O rings in the block or heads? If so I'd have to pass on them.