You can see the power gains below (measured at crank) for each of our camshafts over a factory 5.3L camshaft that we tested on our in-house SuperFlow 902 engine dyno. Stage 1 208/214: +45.1 HP & +21.5 TQ. Stage 2 212/218: +51.4 HP & 22.9 TQ. Stage 3 216/220: +53.4 HP & 22.0 TQ. Keep in mind that these gains are compared at the peak HP and TQ numbers.
Our cams gained as much as 70+ HP and TQ at other points in the dyno graph, and NONE of these camshafts lose any HP or TQ at 2,000 RPM! You can see each of the dyno graphs for each camshaft listed on our website. You can reuse your factory retainers, locks, seats, and seals, as well as your factory pushrods! Pushrod length should always be measured though.
You may need to change to a different length pushrod if you change to a different style of lifters. This will be common for DOD applications. Some lifters do vary in overall length or take different amounts of preload.