Strength of .060 turned down 440 crank?

[timinator]

I purchased a 69 Charger with a 440. The previous owner said it had a bad bearing and the crank had been turned down .060". Apparently the machine shop told him not to abuse it too much since it was much weaker now. I wanted to swap to a different cam which would put this engine into the 425 hp range. My concern is if the crank will hold together. Anyone have any experience with a 440 crank turned down to this size and how much HP they can take?

[John_Kunkel]

The main journals  on 440 cranks are routinely turned down .125" for use in B blocks and the rod journals are routinely turned down .175" for use with Chevy rods and many are running at a lot more than 425 hp.

I would be more concerned about where to find .060" undersized bearings.

[mikepmcs]

 

[firefighter3931]

The main journals  on 440 cranks are routinely turned down .125" for use in B blocks and the rod journals are routinely turned down .175" for use with Chevy rods and many are running at a lot more than 425 hp.

I would be more concerned about where to find .060" undersized bearings.

The crank is plenty strong. Finding a .060 bearing will be a problem though. Most shops draw the line at .030 



Ron

[Chryco Psycho]

or .040 max
could sell the crank for a 451 stroker project & just buy a new crank from 440 Source