Have seen a couple of "virgin" 428 cranks come in right at .012". It is possible that the machinist "brushed" against the thrust surface when turning the crank and opened up the clearance some. Found the same thing last year on a 455 crank I bought "fresh" from the machine shop. I would not run the crank, about the only option is to weld it and regrind the thrust. I'm not aware of any oversize thrust bearings available.....Cliff
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https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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