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Here’s a look at our entire valvetrain hop-up kit, which features Comp’s Xtreme Energy high-lift camshafts (PN 106-462-9LI) and the aforementioned beehive valvesprings and ti retainers. With a 116.0 center line, lift for the hydraulic cams measures 0.475/0.450 (intake and exhaust), and duration at 0.050-inch is 238/240. We’re certain the cams will make a noticeable difference in our engine’s idle. However, more importantly, the cams’ increased exhaust duration is exactly what the big blower needs when it starts making serious boost of 15 psi and better..