well i do not think.. i know as to get a engine to rev fast has not much to do with the crank stroke . i built 4.00 4.250.4375.4.500.4750. and the 4.750 crank engine i have jumps to 8000. very fast . lite mass .but why do you need a fast rev engine ? i have built the stock GM tall deck with the 4.500 crank and thats the way i would go less you have a older block thats not cut out has much for the rods then maybe a 4.375 crank .but for a 2000 more you can build a 632 or 598 with a BIG BORE some times i get the 10.200 deck blocks world or dart .that have lost a piston nothing to bad some times they need a bigger bore to clean up there running them in a class were they can not go bigger on CID and they will not reuse a block . or sometimes they need a sleeve . i do not have any thing at this time when i get them i fix them and they move very fast