So when you put a 440 crank in a 400 block, the minor issue is the counterweight diameter.
383 cranks have a counterweight diameter of 7.125.
On 440 cranks it is 7.500 diameter.
The difference in radius is only 3/16".
It looks to me like 383 counterweights have more than 3/16" clearance around the bottom of the bores.
I've been told you have to machine down the 440 counterweights when you build a 451, but now that I'm
looking at it, it seems like you don't need to.
So I'm wondering what other 451 builders have done. If you keep more metal on the counterweights
it would be easier to internally balance.
Once you build one you'll know.
