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Originally Posted by flwolfman
Barry, what has to be done to a 391 trunk crank other than the reducing the snout and cutting a new keyway? Thanks, Jim
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I think you have to cut the flywheel flange as well, because it is thicker, and to do it right, I think you also need to trim the counter weights, because they are bigger on the 391 crank, and too heavy.
I run a cast "390" crank in mine, some 427's came with cast cranks, as mine was an original replacement short block with a cast crank from Ford. I've heard that drag racers preferred them over the steel ones, because they were lighter, i.e. faster, and still good for 700hp.