COMP Cams 4-Pattern Hydraulic Roller Camshafts 12-473-44

To 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. COMP Cams 4-pattern hydraulic roller camshafts are the first series of cams designed to accommodate a difference in runner length and avoid valves closing at the wrong times. 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 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. They 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 central cylinders are all the same grinds, the outboard exhaust openings are two degrees earlier, with outboard intake closings coming two degrees later. NASCAR has been utilizing this technology for years. COMP Cams is now applying this same knowledge in street vehicles to balance air/fuel ratio per cylinder. These cams are CNC-ground from steel billet cores. They feature cast iron distributor gears and utilize a series of lobes with over .600 in. valve lift and stability up to 7,500 rpm, all while providing more consistent cylinder to cylinder torque. They also feature tight lobe separation for both excellent power and a throaty sound. Designed for small block Chevy, big block Chevy, and small block Ford carbureted or fuel injected applications, the design is exclusive and unique to COMP Cams.Brand: COMP Cams
Manufacturer's Part Number: 12-473-44
Part Type: Camshafts
Product Line: COMP Cams 4-Pattern Hydraulic Roller Camshafts
HP Direct Part Number: CCA-12-473-44
UPC: 036584259640
Cam Style: Hydraulic roller, Retro-fit
Camshaft Use: Street/Strip
Camshaft Manufacturers Description: Best choice for 383 cubic inch stroker engines with good cylinder heads. Very wide power range, 2,600+ stall.
Basic Operating RPM Range: 2,400-6,700
Intake Duration at 050 inch Lift: 236/234
Exhaust Duration at 050 inch Lift: 246/244
Duration at 050 inch Lift: 236 int./246 exh., 234 int./244 exh.
Advertised Intake Duration: 289/287
Advertised Exhaust Duration: 301/299
Advertised Duration: 289 int./301 exh., 287 int./299 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.637 in./0.635 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.621 in./0.621 in.
Valve Lift with Factory Rocker Arm Ratio: 0.637 int./0.621 exh., 0.635 int./0.621 exh.
Lobe Separation (degrees): 109
Camshaft Gear Attachment: 3-bolt
Remanufactured: No
Computer-Controlled Compatible: No
Grind Number: 287QS9
Valve Springs Required: Yes
Quantity: Sold individually.
Notes: 0.900 in. base circle.