Speedmaster PCE255.1004 Poly Sure-Lock Rocker Arm Nut Set 7/16 in. for Aluminum Rockers

The Speedmaster PCE255.1004 Poly Sure-Lock Rocker Arm Nut Set delivers precision valve train control for full roller rocker arms. Specifically engineered for use with aluminum rocker arms, these 7/16 in.-20 threaded polylocks are built to perform under the demands of high-performance and racing applications.

Constructed from heat-treated, premium-grade 4140 chromoly steel, each adjuster delivers an impressive 190,000 psi tensile strength for maximum reliability under sustained load. Precision CNC-machined threads ensure consistent, optimum seat pressure every time, while flush-machined set screws provide solid, reliable contact directly on the studs. No special tools are required for installation, making valve lash adjustment straightforward and repeatable.

Key Features:

• 7/16 in.-20 thread diameter for aluminum roller rocker arms
• Heat-treated 4140 chromoly steel construction — 190,000 psi tensile strength
• Precision CNC-machined threads for optimum seat pressure
• Flush-machined set screws for positive stud contact
• 0.600 in. outside diameter; 1.00 in. overall height
• Minimum rocker slot width: 0.600 in.
• Not for use with stud girdle applications

The Speedmaster PCE255.1004 polylock nut set is an excellent choice for builders seeking precise, secure valve lash adjustment without the cost of premium-brand hardware.