Harmonic Balancer Issue
Hello once again fellow gearheads. I am helping my brother finish putting his chevy 350 together. It has been completly rebuilt, will only be used for street use for the most part. He has a mild cam, quadrajet, etc. He is using the stock crank. Speaking of which, when he was disassembling the engine, taking the old harmonic balancer off, he stripped the threads where the harmonic balancer bolt goes inside the crankshaft. The machinist that did the machine work on the motor re-tapped it. Well, everything is put together on the motor, just went to put the pulley/harmonic balancer on, can't get 60 ft lbs on the bolt which is the spec. The harmonic balancer bolt is a 7/16"-20.
Can I retap the hole to 1/2-20 and try to get it to proper torque?