Quote:

Quote:

All the 400 and 360 flywheels are exteranlly balanced



I think you'll find that some 400 4-speed cranks were forged and are internally balanced...basically the same forged crank found in the 383.


Unless that 383 is a cast-crank '71. Sorry, John, hadda say it.

I would think that a 72 motorhome 413 would have a std 6-bolt crank flange and NOT be an industrial. Does it have the funky waterpump hsg that feeds into the heads?