Did you check your clearances when you rebuilt the motor, rods and mains ? with plasti gauge ? what was the condition of the main bearings and rod bearings when you tore it down ? Myself I will always spend a few bucks at the machine shop and have the rods checked and the crank checked even on a buget rebuild , the $100 to $ 200 bucks is well worth it, buick stuff is not cheap and I only want to be in the motor one time
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