Originally Posted by xafalcon
I have a couple of 400M cranks. Is it possible to use these to make a 4" stroke cleveland? The main jurnals would obviously need to be turned down. The perhaps using a 302C rod there may be a piston that would be suitable?
Any ideas or experience with this?
The short answer is that the 400 (no M) is already a 4" stroke Cleveland. Just put a set of good heads on it, use a decent inlet and some extractors.
I definitely would not recommend turning down the main journals to fit the Cleveland main size. You'd have to take them down by a quarter inch. As Rhett says: it takes a heap of machining, then balancing, and you still only end up with a weakened cast crank.
There is no way that a 400 crank will ever fit in a 351 Windsor block. They both have 3" mains, but the bearing spacing is different and so are the bearing thrust surfaces. You can't even reasonably machine a 400 crank to fit a 351W.
The 400 crank will drop in to a 351M.
The Scat 9000-series "cast steel" cranks (and other manufacturer's corresponding components) are very low cost. Unless you happen to own a machine shop, they are a much cheaper option than cutting down a 400 crank to fit to a 351 Cleveland block.