Has anyone got any experience with these grinds? I find their 12-252-4 (XT256H) and 12-253-4 (XT262H) quite interesting. I haven't got the complete cam-sheet, but here's the info from their catalogue. Competition Cams Xtreme Turbo, hydraulic flat tapet --------------------------------------------------------------------- RPM range Partno Grind no IN /OUT @0.50 Lift Lobe 1800 to 6000 12-252-4 XT256H 256/263 212/212 .447/.444 112 2200 to 6400 12-253-4 XT262H 262/269 218/218 .462/.455 114 Info 12-252-4: Xtreme Turbo - Higher RPM Street applications with 8-16 lbs of boost Info 12-253-4: Xtreme Turbo - Street/Strip applications. Single or Dual Turbos And they only cost $120 from Summit Racing. /Anders

They seem really mild, IMHO. On a stock engine with turbos I might consider the 2nd one. I had Comp grind a custom cam with their extreme 3316 lobe as the intake (236 deg @ .050) and their 3315 as the exhaust (230 deg @ .050), which had mid .500's lift on a 114 or so LS... The custom cam was still only around $300, and with the few extra $ spent, the $/hp is huge. I wouldn't compromise on the cam, since it is the mechanical brain of the engine.

do they have any larger cams? .600+ lift

No they don't, actually they only had 3-4 camshafts designed for turbo application.
I guess I'll follow Andris advice.

/Anders