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i was checking my piston to valve clearance today with clay and noticed my piston to head clearance is rather tight on the piston dome sides(front and back of the piston looking at the motor from the front).i busted out my ancient direct connection engine manual and I am well under the spec in the book but times have changed so to speak so wondering if you guys check this and what is a safe minimum.I am running the best composition gasket which is 050 thickness

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It depends on which rod and head material and intended RPM I would shoot for .035 to .040 on a steel rod motor kept under 7000 RPM with iron heads, add .005 up to 8500 RPM and shoot for .055 to .070 on a aluminum rod motor with the same RPM Aluminum heads need more also Keep in mind that to much P.TO V and P to the head is a lot safer than a tiny bit to little