This is the cam to use if you are looking to run in the 4,000-5,200rpm if you have a cylinder head that does not flow all that well (190-230CFM),this cam will help you get band-aid poor airflow through the head. The tradeoff? You lose a some lower rpm performance so your HP curve is not as broad. If you have a head that has peak flow above 240CFM, and you want to make your curve more broad, go for the 220-240. With steel cams and cast cams alike it is important to run bushings in your block on all journals if the springs pressures and rpm are at elevated levels. This is especially true if you have a larger duration camshaft like the 232-252. You will need .250" valve reliefs as well as aftermarket pushrods and springs with this cam.