I have a 604 Predator engine in my dragster, but haven't run it yet. I'll know next year when we go to Las Vegas in Feb. It's a 604, 15-1, 1 1250 carb, Marcella sheet metal intake, made 1117 on gas. If it weren't for the Predator heads flowing over 500 cfm,I would have just built a 572. Everything for the raised cam block is $$$$$$. PS. I posted the dyno session on here a couple of months ago, if you wanted to do a search. And B1 Johnny had Best machine build him a 588 PSO that made over 1200, if IRC.