318 piston ring gap

toolmanmike said

Stick the ring in the bore and level it with the piston top then measure the gap. That works with flat tops. I like to measure down a inch or so. It get's past any taper.

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Yep, just flip a piston over with no rings on it, and use it push the ring down about 1/2-1" from the top (or where you think is most critical), pull out the piston, and measure. If tapered, I would want know the situation at the top and down in the bore too.