This is a question that has no answer, other than, "when the crank breaks, THAT was the limit" for that crank. Same as how much power, can my stock block, 8.75 rear, or whatever take. There is no set number Many on here have had good luck, as read in these posts, I can produce just as many however, that broke a cast crank on a 100hp shot. I guess the bottom line here is this, you want to spray your stock, cast crank motor, go ahead, just don't be surprised when it breaks the crank or shatters a cast piston, because it DOES happen all the time.

Monte