440 crank in 383 block

moper said

As was said, counterweights need to be reduced in diameter and main journals turned down to B wedge size. As far as the amount removed... there is no surface hardening on factory RB cranks unless it's a 426 Hemi. However, it is a lot to be done to a factory crank. It is not cost efficient IMO. Best bet is the 440Source B wedge 3.75 stroke crank. Better part, stronger, heavier (which means easier to balance with the RB rods), and drop in.

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All true and a good point.The factory crank is also limited to about 600 h.p at the most. The 440source stuff is good,seems to be a lot of guys using thier stuff.

I dont reccomend boring the mains to the 440 size.First your losing some material in the saddle area and second,your going to a bigger bearing which will rob power from the engine.And you'll still need to turn down the counterweights on the crank.

I think the most cost effective route may be to purchase everything from 440source and have it balanced by your machinist.