Of coarse I also have the arp 925 head studs, harder valve seats and a mild port polish, and heavier valve springs. I'll be ordering a clutch today so the balancing can be finished but it's getting time to figure out nozzles and turbos. Kinda limited at a 1000 hp by the 12v rods and don't want to risk it. Or spend the money on rods. Thanx for any opinions or suggestions you may have.