Engine & Performance Warehouse RK840SPN Pro Stock Nitro-Carburized Rocker Arm Ball and Nut Kit SBC 1.6 Ratio

The Engine & Performance Warehouse RK840SPN is a Pro Stock, stock-appearing nitro-carburized high-performance rocker arm, ball, and nut kit engineered for small block Chevy applications. Featuring a 1.6:1 rocker ratio and designed for 3/8" diameter studs, this kit delivers improved valve lift and increased performance over standard OEM rocker arms while maintaining a stock-appearing profile — ideal for racing classes with appearance restrictions.

Key Features:

• Nitro-carburized surface treatment provides 3–5 times greater resistance to wear, fatigue, and fracture in high-stress areas
• 1.6:1 rocker ratio increases valve lift over stock for improved airflow and power output
• 3/8" stud diameter compatibility for standard small block Chevy stud-mount heads
• Pro Stock stock-appearing design — qualifies for racing classes requiring OEM-style rocker arms
• Precision die-formed steel construction engineered to meet or exceed OEM quality standards
• Kit includes rocker arms, balls, and nuts — everything needed for a complete installation
• Eliminates pushrod cup and fulcrum failures through superior surface hardness properties

This rocker arm kit is a direct-fit performance upgrade for small block Chevy engines (262–400 cubic inch), making it a popular choice for street performance builds and stock-class racing applications where reliability and a factory-correct appearance are required.