Here is my delema: I recently bought a flywheel off E-bay, it was advertised as a 454 flywheel... I went to go pick it up and it looks just like the one I already have from a 350! The bolt pattern is the only difference! Here is what I got, The 6 bolt pattern in the center are 3" exactly center to center accross. It is 168 tooth, 14" dia, fits a 12-11 inch clutch..... I will post pictures as soon as I find my Digital camera! I called Chevy and the counter guy supposedly ran the cast number and said it was a 350/305 flywheel! The guy who sold it to me said he's a moron and something about counterweights! The bottom line is, I NEED to know if this is for a 454, because if it's not, the guy won't give me my money back unless I prove him otherwise, or pay shipping which voids the deal! Crap! /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif /forums/images/graemlins/angryfire.gif Please help with any info you can!!!! OH, here are all the numbers on the flywheel: 14091599N (Cast Number) 599 (On Front) B (On Back) 220S (On Back) GM4 (On Back) Here are the pictures I promised: ???454??? Flywheel In the pictures of the flywheels side by side, the one on the left is a 350, the one on the right is the questionable 454! You can see the counterweight thing on the back, hope these help, sorry but it's a cheap camera! I see the counterweight section, but how does it make it a 454 flywheel? Thanks for whoever can shine some light on this!