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I ordered 0.030 oversize and the end gap was an interference fit. I filed the end gap to 0.014" as the manufacturer's instructions was to have an end gap og 0.004" per inch of diameter.

I think someone put standard rings on an oversize piston.

The did the calculations and 0.030 should give me a difference of 0.094" . That should take up most of the end gap.

PS, The rings that came out had an end gap of 0.11" and the oil rings would fall out of the cylinder. It all adds up to zero or very little compression. And if it started, it would smoke like a freight train.

The connecting rods have STD stamped on the back.

It has an arrow pointing to the front and 0.020 on the top of each piston. I measured the pistons and the bore across several diameters came out 3.125. I used a dial caliper. I know that isn't the best way to measure, but I'm pretty sure it's not off by 0.020.

I am in the process of tearing down a F series engine and have a few questions. First according to the specs, the bore is 3.125" and when I measure the bore it is indeed 3.125" and there is practically no ridge. Should come out with a little honing. But something doesn't quite pan out. The...