Are you referring to plastigauge ? Like main bearing gap ?. Please be more specific . If it is, neither rods, nor mains should have a .039" "squish.". Try .0010-.0020 on mains, and .0020-.0025 on rods. That's the range I used. I was told not to use plastigauge. Measure everything with a micrometer, and bore gauge until you get the gap you're looking for. Good luck !.
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