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4-Pattern 253/263 IB, 255/265 OB Hydraulic Roller Cam for Ford 351W

4-Pattern 253/263 IB, 255/265 OB Hydraulic Roller Cam for Ford 351W is recommended in larger c.i. and high Compression applications. 3500+ Stall. (Note: Larger cam lobes for outboard cylinders)
In stock

Hydraulic Roller: 4-Pattern 305QIO8 - Recommended for larger c.i.d. and high compression applications. 3500+ Stall.*

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 RPM

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. 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.

*Upgraded valve train components and aftermarket cylinder heads required

4-Pattern Vs. Xtreme Energy

More Information
UPC 036584259756
Manufacturer COMP Cams®
Emissions Code
Engine Family Ford 351W 8 Cylinder (1969-1996)
RPM Operating Range 3,300-7,500
Cam Type Hydraulic Roller
Camshaft Series 4-Pattern
Camshaft Gear Attachment 1-Bolt
Usage Street/Strip
California Proposition 65 WARNING: Cancer and Reproductive Harm
Advertised Inboard Intake Duration 305
Advertised Inboard Exhaust Duration 317
Advertised Outboard Intake Duration 307
Advertised Outboard Exhaust Duration 319
Inboard Intake Duration at .050 Inch Lift 253
Inboard Exhaust Duration at .050 Inch Lift 263
Outboard Intake Duration at .050 Inch Lift 255
Outboard Exhaust Duration at .050 Inch Lift 265
Inboard Intake Valve Lift 0.638
Inboard Exhaust Valve Lift 0.622
Outboard Intake Valve Lift 0.638
Outboard Exhaust Valve Lift 0.622
Lobe Lift Intake .399 / .399
Lobe Lift Exhaust .389 / .389
Lobe Separation 107.5
Intake Centerline 103 / 102
Valve Timing Lift 0.006
Exhaust Close ATDC 47 / 47
Intake Open BTDC 49 / 49
Exhaust Open BBDC 92 / 90
Intake Close ABDC 78 / 76
Lifter Style Hydraulic Roller