Great writeup on Dynamic Compression

Hey YR What are the cam specs you are running with the 11:1CR?

My dad's 383 is iron headed with 915 heads. They were heavily shaved and ported. It is all cced out and is a true 11:1. He has an Ultradyne solid roller with 254@050 intake and 110 LSA. Our best octane here is 92. I've never heard his engine ping. I know he runs right at 38. The engine does not run hot.



Wallace racing has a Cranking cylinder pressure calculator. You also get an estimate if you use the dynamic compression calculator there. I don't know how accurate those estimates are.

Cranking Pressure Calculator