Quote:
Originally Posted by bluestreak1854
the 401 and 478 have an externally balanced crankshaft-- that means that the flywheel and harmonic balancer have the counter weights on them-- if someone has the wrong flywheel or balancer on this engine it could be sending vibrations that are loosening the rod nuts-- but the vibration should be very noticeable
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That is definitely something to check.
Also, only the 379, 432, and 478 have externally balanced flywheels. The 401 should be the same crank as a 305 and 351.