i have skunk2 pro1 cams with skunk2's titanium dual valve springs and retainers and their flat face titanium valves..... im very disapointed with this setup only made 189 ( was originally 172 stock) to the wheels and thats with a dc header, 2.5" straight exhaust (no cat). I'm thinking about putting the stock cams back in, it ran a faster time with stock cams at the track as well.