Manley 434211-16 - 58-81 Pontiac 287-455 1.52in x 7/16in Aluminum Roller Rocker Arm Kit

Manley 434211-16 - 58-81 Pontiac 287-455 1.52in x 7/16in Aluminum Roller Rocker Arm Kit

Manley Aluminum Rocker Arm Kit-PONT 287-455 & 4.3L V8 1958-81, 1.52 x 7/16"

Ratio: 1.52 - Stud: 7/16 in. - Fits: 1958-1981 Pontiac V8 (287-455 and 4.3L)

Our all-new Pro Series Billet Aluminum Rocker Arms are engineered for top performance across street, strip, and track applications. Machined from high-quality 2024 billet aluminum extrusions, these rockers feature precision-ground needle and cage bearings, reducing friction with full complement needle bearings. With the heat-treated and polished steel nose rollers, axles, and trunions, wear is minimized for lasting durability. An anodized finish enhances protection, and each 16-piece set comes complete with Poly Locks for secure installation.

• CNC-Machined from 2024 Billet Aluminum
• Anodized Finish for Increased Durability Under Extreme Heat Conditions
• Shot-Peened to Increase Strength & Reduce Stress Risers
• Heat-treated and Polished Steel Axles Have a 60-62 Rockwell Hardness
• Rated at 750lbs Open Spring Pressure
• Multiple Oil Channels for Pushrod and Valve Tip Lubrication
• Poly Locks Included for Secure Installation
• Small Block Chevy Rockers Clear 1.625 O.D. Valve Springs