L78 & Today's Pump Gas? - The Supercar Registry

#13

04-23-2021, 07:58 PM

big gear head big gear head is offline

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I'm running open chamber pistons. I measured the combustion chamber volume, head gasket volume and piston dome with a piston deck height of about -.005 and did the math. It came out to 10.99:1, which is pretty much 11:1. The open chamber shape and aluminum material may help. I also probably have more valve overlap with my cam than what a stock L78 cam has, which would lower the cranking compression.

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Freddie
1969 Camaro RS/SS396 (427) 4 speed

Last edited by big gear head; 04-23-2021 at 08:02 PM.

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