[MVR 155]

Any time you go from stock to a higher lift/duration camshaft I would suggest going with a good set of valve springs and retainers. I would also urge you to do some research before slapping a LS6 or other high RPM cam in your rig...... these trucks are very heavy, you want a cam that is gonna give some good low end torque otherwise you will actually hurt your performance down low and have something that your gonna have to have your foot in hard all of the time. I would suggest talking to a reputable speed shop that has done intalls on trucks and see what they say.