I should clarify a little, there are 2 events pictured here. The scored piston and destroyed bearing is from the 1st build. No ether was used for starting, and by the time we got the fuel system primed, the guage was showing 30 psi at cranking. The failure happened on the dyno, after break in, so no I didn't get a chance to cold pull it or lug it. The shop admitted it looked to them like the bore clearance was wrong. The top pictures are after the 2nd build. Cylinder walls look OK, but I have a question for Vic (you devil LOL) what would the explanation be for cutting the valve reliefs in the wrong place on 2 pistons, and not deep enough (but in the right place) on the other 2? And for having the wrong front cam bushing installed, which makes it obvious they didn't measure that clearance upon assembly? I do agree that this is pulling, and we're trying to push this old iron way beyond what it was designed for, so the scored pistons didn't upset me all that much. Hey, stuff happens, but everything else I have wrong here is extremely frustrating.
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