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ZEKE68 · 04-20-2018, 10:32 PM

Are you sure that the pistons you have will work with the closed chamber heads? It also depends on how radical the cam is. More overlap means you can get away with more compression. A mild cam with 9.5 cr and iron heads may be too much compression for pump gas. There are dynamic compression estimating programs on some internet sites. I am running open heads with 20cc dome pistons which give around 9.4 static cr, I am running a 224/234 @ .05" cam with 110 LSA. Have not hit the road yet so I can't tell you how it does.

04-20-2018, 10:32 PM	#2
ZEKE68 Registered User Join Date: Jul 2012 Location: Space Coast, Florida Posts: 403	Re: Closed Chamber VS Open Chamber BBC heads Are you sure that the pistons you have will work with the closed chamber heads? It also depends on how radical the cam is. More overlap means you can get away with more compression. A mild cam with 9.5 cr and iron heads may be too much compression for pump gas. There are dynamic compression estimating programs on some internet sites. I am running open heads with 20cc dome pistons which give around 9.4 static cr, I am running a 224/234 @ .05" cam with 110 LSA. Have not hit the road yet so I can't tell you how it does. __________________ 1968 SWB Step Side, Big Block, 4L80E , Running!