Comp Cams Camshaft 4-Pattern Hydraulic Roller Advertised Duration 31 12-477-44

Notes: Camshaft 4-Pattern Hydraulic Roller Advertised Duration 313 OB/311 IB Int. 325 OB/323 IB Exh. .637 OB/.637 IB Int. Lift .621 OB/.621 IB Exh. Lif

The 4-Pattern hydraulic roller cams are CNC-Machined from steel billet cores with cast iron distributor drive gears. The cams also feature a tight lobe separation for both excellent performance and a throaty sound. The camshafts feature four different lobe patterns with one intake and exhaust design for outboard runners, and another intake and exhaust design for the inboard runners. While the four inboard cylinders are all the same grinds, the outboard exhaust openings are two degrees earlier, with outboard intake closings coming two degrees later. This is the first ever use of technology in street vehicles to balance air/fuel ratio per cylinder and can net you a possible 1000+ RPM over other hydraulic rollers and anywhere from 5-20+ horsepower peak to peak, depending on cylinder head flow.