Speedmaster DNA Aluminum Roller Rocker Arms 1.6 Ratio for Mopar Chrysler BB 383 440 Engines

The Speedmaster DNA Aluminum Roller Rocker Arms Set (1-261-027) is engineered for Mopar Chrysler big-block engines, specifically the 383 and 440 models. Featuring a 1.6 ratio design, these aluminum roller rocker arms deliver improved valve actuation and reduced friction compared to stock components, making them ideal for both street and performance applications. The DNA brand engineering ensures reliable operation and longevity in demanding engine environments.

These roller rocker arms are designed as a complete replacement set for original equipment, maintaining OEM fitment while providing the durability benefits of roller technology. The aluminum construction keeps weight down without sacrificing strength, and the shaft-mounted configuration ensures proper valve train geometry. Whether you're rebuilding a classic Mopar engine or upgrading an existing 383 or 440, this rocker arm set provides the precision and performance your engine demands.

Key Features & Benefits

• 1.6 Ratio Design: Engineered specifically for Mopar Chrysler 383 and 440 big-block engines to optimize valve timing and lift.
• Aluminum Roller Construction: Lightweight aluminum body with roller bearings reduces friction and wear in the valve train.
• OEM Replacement Set: Direct replacement for original rocker arms on compatible Mopar big-block applications.
• DNA Engineering: Built to Speedmaster's DNA brand standards for reliability and consistent performance.

Specifications

Ideal Applications

• Street rod and classic car restoration for Mopar 383/440 engines
• Performance engine rebuilds requiring improved valve actuation
• Original equipment replacement for worn or damaged rocker arms
• High-performance driving and modified engine applications