need help with dynamic compression ratio

Southernman said

I see what you're trying to do now. The number you use is 64 ABDC. Don't use any numbers @ .050 (the valve is still open).

Southernman

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He wasn't going to use .050" figure - KB Silvolite's calculator recommends using that figure plus 15 degrees rather than advertised seat timing. It gives DCR on the high side in most cases, especially if you're using an Edelbrock grind! :toothy7: