Use the .50mm gasket or even stack a .50 and a .25 to get close to that 1mm. Otherwise you are losing volume and elevating your CR which could mean detonation.
Looks like you know what you are doing, make sure the piston is TDC and not wobbling, Also have you torqued the cylinder to spec?
Shane
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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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