Crower Pontiac 287-455 Compu-pro Hydraulic Cam (284-hdp)

Pontiac Hydraulic Flat Tappet Camshaft

Intended for the performance oriented hot street application. These cams offer an extended rpm range with emphasis on upper bottom to top end power (strong mid-range). Performance gears, headers, dual exhaust, larger than stock cfm carburetor, performance

Level 3 camshafts are designed for moderately modified engines. Intended for performance hot street/strip and performance marine applications.

These higher lift and longer duration camshafts demand close attention to rear end gearing and tire diameter combinations. The secret here is to pick a ring and pinion gear set and tire diameter that keeps the engine in its optimum rpm power range. Automatic transmissions with an aftermarket high stall torque converter and manual transmissions. Headers, dual exhaust, larger than stack carburetor, performance manifold and increased compression (9.5:1 to 10.5:1) are required. Mild porting and larger valves will improve performance.

Moderate lope at idle. Extended rpm range with emphasis on upper bottom to top end power and a strong mid range.

Specifications

• Engine Make: Pontiac
• Year: 1955-1981
• Part Class: Camshaft
• Camshaft Name: High Performance Compu-Pro
• Camshaft Series: Compu-Pro
• Engine Type: V8
• Engine Size: 287, 301, 316, 341, 350, 370, 389, 400, 421 & 455
• Product Type: Hydraulic Flat Tappet
• Valve Lash: .000" intake and .000" exhaust
• Lobe center: 112
• Advertised Duration: Intake / Exhaust: 284 / 290
• Duration @ .050" Lift: Intake / Exhaust: 228 / 235
• Lobe Lift: Intake / Exhaust: .319 / .329
• Rocker Ratio: Intake / Exhaust: 1.5 / 1.5
• Gross Valve Lift: Intake / Exhaust: .479 / .494
• CID: 428
• Performance Level: 3
• Low RPM: 1600-1800
• Peak HP: 4500-4800
• Redline: 6000