Sorry about the second post fellas. I was wondering if you have to clearance the block of an LS1 for a longer crank through like you would if you were making an old style 350 a 383. Any input would be greatly apreceated.

 

A 4" stroke should fit, but you have to check if the rod bolts clear. Nothing major, nothing a quick hit with the dremmel can't fix. The #8 piston might need massaging to clear the reluctor wheel. The windage tray will need to be spaced also.