Speedmaster Pontiac 326 400 455 1.52 Ratio 7/16" DNA Aluminum Roller Rocker Arms Set

The Speedmaster DNA® Aluminum Roller Rocker Arms Set (1-261-015) is a high-performance rocker arm assembly engineered for Pontiac 326, 400, and 455 cubic-inch engines. This set features a 1.52 mechanical advantage ratio and 7/16" stud diameter, delivering reliable valve actuation with reduced friction through roller design. Constructed from lightweight aluminum and DNA® technology, these rocker arms are built to withstand demanding engine conditions while improving overall performance and durability.

Roller rocker arms are ideal for street and performance builds where reducing valve train friction and extending component life are priorities. The 1.52 ratio provides optimized valve lift geometry for these classic Pontiac engines, making this set compatible with a wide range of 326, 400, and 455 applications. Whether you're rebuilding a stock engine or upgrading a performance platform, this rocker arm set delivers the precision engineering and quality construction that serious enthusiasts demand.

Key Features & Benefits

• DNA® Aluminum Construction: Lightweight aluminum design reduces rotating mass and improves engine efficiency.
• 1.52 Mechanical Ratio: Optimized valve lift ratio engineered specifically for Pontiac big-block engines.
• Roller Design: Reduces friction and wear on cam lobes and pushrods for extended component life.
• 7/16" Stud Diameter: Direct bolt-on fitment for Pontiac 326, 400, and 455 engine blocks.
• High-Performance Engine Upgrade: Ideal for street, race, and restoration builds requiring valve train reliability.

Specifications

Ideal Applications

• Classic Pontiac engine rebuilds and restorations
• Street and performance car engine upgrades
• High-performance hot rod builds
• Engine swaps requiring Pontiac valve train components