My truck isn't exactly a competition truck, but I am trying to build it up to around 600ish hp. My question is what is a good cam to go with, or what do you guys use? I have heard good things about Hamilton cams and so far I am looking at their stage 3. My other question was if I get a cam that isn't a regrind do I need to change the tappets. I really dont want to tear in under the engine, and am hoping that I can just bolt the new cam in without doing the tappets. BTW the truck has 200k on it. Thanks. Not sure if this is the right forum.