Comp Cams CS 47S XS282S-10 Good for Oval Track Vaccuum Rule Overland Sector With the reduced back pressure

With the reduced back pressure

The bottom of the bag is reinforced with small rubber studs

Simple bolt-on installation with no drilling or cutting required

Pressed-in Patented Cover Plate Design

so if you have an aftermarket knuckle

Comp Cams CS 47S XS282S-10 Good for Oval Track Vaccuum Rule Overland Sector With the reduced back pressureSmart engine builders understand the benefits of a 4&7firing order swap camshaft, which exchanges the 4 and 7 camshaft lobe timing in small and big block Chevrolet engines. While some builders have realized significant horsepower gains, all of them experience the exceptionally smooth torque curve possible with this new firing order technology. Dyno, Spintron and track tested, the Xtreme EnergyT 4&7Solid Lifter Camshafts do not require any engine