The #1 cylinder problem has happened 3 times on one I've been working with, still don't know why! I helped assemble one another shop had machined, and it scored the #1 piston and cylinder in about 2,500 miles. We tore it down, sleeved the cylinder, installed a new #1 piston, and reassembled. Scored again in about the same time frame. Got another block, different pistons, 307 V-8 flat tops this time, and it's knocking again! Also, the replacement block we got had massive wear in the #1 hole, and had to be sleeved. It looks like there's a cooling or lube problem on at least some 250's at the front. Anybody got some words of wisdom?
Jerry

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