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Did you find out where the air is getting by? Intake or exhaust? Both?
When checking compression, even if the chain skipped a tooth I think you will be off the lobe of the cam at TDC, so the rocker shouldn't be holding the valves open.
Maybe you could back the adjustment screws, on one cylinder, all the way out and do the compression check again.
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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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