Speedmaster Ford SB 289 302 351 Windsor 1.6 Ratio 5/16" DNA Aluminum Roller Rocker Arms

Speedmaster's DNA aluminum roller rocker arms are engineered for Ford small-block 289, 302, and 351 Windsor engines. Built from lightweight aluminum and featuring DNA technology, these rocker arms deliver reliable valve actuation with a 1.6 mechanical ratio and 5/16" stem diameter. The roller design reduces friction and wear on pushrods while improving valve lift efficiency, making them ideal for both street and performance applications.

These roller rocker arms offer durability and consistent performance across a wide range of engine speeds and load conditions. The 1.6 ratio provides moderate valve lift multiplication, suitable for stock and mildly modified Windsor builds. The precision 5/16" stem ensures proper fitment with standard Windsor cylinder head guides. Speedmaster's manufacturing standards make these rocker arms a practical choice for engine rebuilds, restoration projects, and performance upgrades on classic and contemporary Ford small-block applications.

Key Features & Benefits

• DNA Aluminum Construction: Lightweight aluminum body with DNA technology for durability and heat dissipation.
• Roller Design: Roller bearings reduce friction on pushrods and increase valve actuation efficiency.
• 1.6 Mechanical Ratio: Provides 1.6x valve lift multiplication for moderate lift gains on Windsor engines.
• 5/16" Stem Diameter: Standard stem size ensures compatibility with Ford Windsor cylinder head guides.
• Ford SB Compatible: Fits Ford 289, 302, and 351 Windsor small-block engines.

Specifications

Ideal Applications

• Classic Ford engine rebuilds and restoration projects
• Performance street and strip applications on small-block Windsors
• Stock and mildly modified Windsor engine builds
• Custom hot rod and muscle car engine swaps