Speedmaster Pontiac 326 400 455 1.65 Ratio Aluminum Roller Rocker Arms Set, 7/16" DNA

The Speedmaster Pontiac 326 400 455 Roller Rocker Arms Set (Model 1-261-016) is a complete engine valvetrain component designed for 1960s and 1970s Pontiac big-block engines. Featuring a 1.65 ratio and 7/16" bore diameter, these aluminum roller rocker arms reduce friction and wear on pushrods and valve stems during high-RPM operation, improving reliability and engine response in street and mild performance applications.

Constructed from aluminum with DNA® technology, this rocker arm set delivers superior corrosion resistance and lightweight performance compared to cast-iron alternatives. The roller design minimizes contact friction, allowing for sustained engine operation without premature wear. Compatible with Pontiac 326, 400, and 455 displacement engines, this set is ideal for restoration projects, engine rebuilds, and street performance upgrades where original or period-correct components are desired.

Key Features & Benefits

• 1.65 Ratio Design: Optimized valve lift ratio balances engine performance across Pontiac big-block engines.
• Aluminum Construction: Lightweight material reduces overall engine weight compared to cast-iron rocker arms.
• 7/16" Bore Diameter: Direct fit for compatible Pontiac 326, 400, and 455 engine blocks and cylinder heads.
• DNA® Aluminum: Advanced alloy formulation provides enhanced corrosion resistance and durability.
• Roller Design: Reduces friction and wear on pushrods and valve stems for reliable long-term operation.

Specifications

Ideal Applications

• Pontiac big-block engine restoration and rebuild projects
• Street performance upgrades for classic Pontiac vehicles
• Engine valvetrain replacement on 1960s–1970s Pontiac models
• Performance tuning to reduce friction and improve reliability