Our Stage 3 Kit consist of a cylinder heads and cam package that has proven a 100rwhp gain over stock numbers. We only use the best for our heads and cam upgrades built by Inertia you are sure to get the most bang for your buck. Different camshafts are available from mild to wild we'll have you smokin tires in no time. The new Premium Big Valve Heads have the Manley valves with the pro-flow shape. Valve sizes are 2.10/1.625 for the 6.1 and 2.02/1.575 for the 5.7 head. The new Manley valves will be running single groove locks with high quality Crower keepers and retainers which blow everything else we've seen away in quality. Essentially, the Premium Big Valve Heads are the best quality components that we can source with the Manley valves and Crower locks and retainers. Our Kit price includes the Big Valve Heads however you can select the performance heads if your going with a mild cam. You can also upgrade to include ported and thermal coated Intake, milled and tuned throttle body and all other necessary hardware like gaskets & pushrods Diablosport Predator required for tuning. Recommend CAI.