well i will say that so many of the fast streetable cars were the 346" forged type motors. there were a bunch of 9.9-10.1 nitrous 346" combo. i talked to tony whately (9-ball) over the shootout and he said if were to build a car for drag racing he would go 346. kinda says something considering how close he is to the MTI crew. also the sleaves i am not sold on still. either way there are so many ways to go fast with an ls1. i will stick with a 346 hydro cam myself.