I use this dynamic compression ratio calculator, I hope it’s of use to you,
https://uempistons.com/p-27-compression-ratio-calculator
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS
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