ARP 135-7221 High Performance Rocker Arm Studs 8740 Chrome Moly 2-Piece

ARP High Performance Series rocker arm studs are precision-engineered to eliminate the wobble and inconsistent geometry common with standard rocker studs. Each stud is manufactured to exacting tolerances, with concentricity held within .005 T.I.R. thread pitch to thread pitch, ensuring straight and true installation every time.

Key Features:

• Constructed from 8740 chrome moly forgings, heat-treated to 180,000 psi tensile strength
• Precision ground tip for optimum adjuster seating
• Exact length specifications provide positive seating with every installation
• Extra-large radius base offers superior resistance to flex under high loads
• Concentric within .005 T.I.R. for consistent rocker geometry
• Includes 2 pieces per package

These High Performance Series studs are ideal for E.T. bracket racing, limited rule oval track competition, and high-performance street applications. The precision manufacturing ensures consistent valve train geometry across all cylinders, which is critical for reliable performance and engine longevity.

Important Installation Notes:

• Not compatible with OEM-style self-locking nuts
• Must be used with ARP's patented Perma-Loc adjusters
• Verify optimal stud length for your application, especially when using longer-than-stock pushrods or valves
• When using non-stock components, you may need to adjust rocker arm installed height to maintain proper valve train geometry

ARP rocker arm studs deliver the precision and strength needed for demanding performance applications where valve train stability is critical.