COMP Cams 12-477-44 - Comp Cams 4-Pattern Camshafts
JEGS Part Number: 249-12-477-444-Pattern .900" Base Circle Retro-Fit Hydraulic Roller Camshaft
Small Block Chevy
Intake Lift: .637"/.637"
Exhaust Lift: .621"/.621"
Lobe Separation Angle: 110.5°/109.5°
RPM Range: 3200-7500
Comp Cams 4-Pattern Camshafts
Comp Cams 4-Pattern Camshafts are hydraulic rollers designed to optimize valve events based on runner length and feature a large increase in both area under the curve and stability at high RPMTo make the most power from your engine, you need to optimize the air ingested and captured by avoiding valves closing too soon or too late. Any conventional center layout single throttle body or carbureted V8 intake manifold features longer outboard runners and shorter inboard runners, meaning that each valve event should occur at a different moment. COMP Cams 4-Pattern Camshafts are the very first series of cams designed to accommodate this difference in length and avoid valves closing at the wrong times. NASCAR teams have been using camshafts designed this way for years, and using lessons learned along with them, COMP Cams has designed a series of cams that optimizes valve events and features a large increase in both area under the curve and stability at high RPM. 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. 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. Note: Upgraded valve train components and aftermarket cylinder heads required.
COMP Cams 12-477-44
Exhaust Valve Lift (in.)
Intake Valve Lift (in.)
Int. Duration @ .050 in. (Deg)
Exh. Duration @ .050 in. (Deg)
Int. Duration Advertised (Deg)
Exh. Duration Advertised (Deg)
Chevy Small Block (262-400)
Hydraulic Roller Retrofit
313 int./325 exh., 311 int./323 exh.
Advertised Exhaust Duration
Advertised Intake Duration
Basic Operating RPM Range
Hydraulic roller tappet
Camshaft Gear Attachment
Duration at 050 inch Lift
260 int./270 exh., 258 int./268 exh.
Exhaust Duration at 050 inch Lift
Exhaust Valve Lift with Factory Rocker Arm Ratio (
Intake Duration at 050 inch Lift
Intake Valve Lift with Factory Rocker Arm Ratio (i
Valve Lift with Factory Rocker Arm Ratio
0.637 int./0.621 exh., 0.637 int./0.621 exh.
Valve Springs Required
Lobe Separation (Deg)
Manufacturer's Part Number: