Re: Do OEM main bearings have date codes?
Those look to be original. Here are my original bearing numbers:
Front main bearings: (A) in circle, 55084 GMM 400 15C9. Other half: (A) 63377 GMM 400 16C9 0006
Rear bearing:57798(B)GMMA 295Q8 other half: 57799 (B) GMMA 001 3H9
Rod bearing: (B)GM AT-20 P-16 10 68 other half: (B) GM AT-20 P-44 12 68
So yes, they are date coded and original.
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1962 Oldsmobile Jetfire, Factory all Aluminum V8 Turbocharged and Methanol Injected TURBO ROCKET engine, 4 speed Hydramatic, 4 link rear suspension, 3.36 Anti-Spin differential, California car, PS, PB, PW, AC, Jetfire 2 option package.
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