Currently running 76cc GM iron heads (462624 casting) with H618CP domed pistons and Performer RPM cam. Current CR is 9.38:1 and quench area is 0.063". Heads are currently off and I'm considering one of the following options...
#1 Mill heads (just to be sure they're 100% flat) and install Felpro 1094 gaskets (0.015" compressed). New CR will be 9.9:1 and quench area will be 0.040"
#2 Replace heads with Edelbrock Performer RPM with 70cc chambers and install with Felpro 1094 gaskets. New CR would be 10.7:1 and quench area would be 0.040"
How much extra do you think I'd gain with both options. New heads aren't cheap, so I don't want to go that route if the gain is going to be relatively small. From the very helpful folks on here, I now know that newer/better heads like Vortecs or the newer Dart heads aren't suitable for my application due to heart/kidney-shaped chambers and my domed pistons.
Thanks,
Ian.
#1 Mill heads (just to be sure they're 100% flat) and install Felpro 1094 gaskets (0.015" compressed). New CR will be 9.9:1 and quench area will be 0.040"
#2 Replace heads with Edelbrock Performer RPM with 70cc chambers and install with Felpro 1094 gaskets. New CR would be 10.7:1 and quench area would be 0.040"
How much extra do you think I'd gain with both options. New heads aren't cheap, so I don't want to go that route if the gain is going to be relatively small. From the very helpful folks on here, I now know that newer/better heads like Vortecs or the newer Dart heads aren't suitable for my application due to heart/kidney-shaped chambers and my domed pistons.
Thanks,
Ian.