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I have a 351M that I converting to a 400 by swaping the crank and pistons. My question is, are the harmonic balencers the same on the 351M and 400?
The 351M uses a different harmonic balancer than the 400 -- It is best to buy a new 400 harmonic balancer to go along with a 400 crankshaft. You can use a 351M balancer, however, you will have to rebalance the 400 crankshaft by adjusting the counter weights to bring the assembly into balance. Also, the timing marks on the 351M balancer will be nearly useless on a 400 crank
You lost me a little on that one. ........Guess I'll get a 400 harmonic balencer rather than try to modify a new crank.