09 and up 5.7 and 6.4 are both Variable valve timing (VVT) blocks, which have different cams, covers, and cranks. They need more room up front to package all this, so the front of the block is different. Not sure on the cranks, but they need a different shape on the front, not sure how that is accomplished.

Last edited by gregsdart; 01/15/15 12:36 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky