Speedmaster Holden 253 304 308 1.65 Ratio 3/8" DNA Aluminum Roller Rocker Arms Set 1-261-008

The Speedmaster 1-261-008 is a complete set of DNA® aluminum roller rocker arms engineered for Holden 253, 304, and 308 engines. This high-performance rocker arm set features a 1.65 ratio design with 3/8" bore sizing, delivering precise valve actuation and durability for street and competition applications. The aluminum construction reduces reciprocating mass while maintaining strength, supporting better engine efficiency and valve response.

These roller rocker arms are direct replacements for factory units and compatible with the specified Holden engine platforms. The DNA® aluminum design minimizes friction and wear, extending component life while maintaining consistent valve timing and lift characteristics. Ideal for engine rebuilds, performance upgrades, and maintenance of classic and modern Holden V8 engines, this set provides the precision engineering required for reliable high-RPM operation and daily driving confidence.

Key Features & Benefits

• 1.65 Ratio Design: Engineered to deliver precise valve lift multiplication for optimized engine performance and efficiency.
• DNA® Aluminum Construction: Lightweight aluminum body reduces reciprocating mass while maintaining durability and strength.
• 3/8" Bore Sizing: Direct compatibility with Holden 253, 304, and 308 engine configurations.
• Roller Design: Rolling contact reduces friction and wear on valve stems and pushrods for extended component life.
• Complete Set: Full rocker arm assembly ready for installation on compatible Holden engine platforms.

Specifications

Ideal Applications

• Holden V8 engine rebuilds and restoration projects
• Performance engine upgrades and tuning applications
• Replacement rocker arms for high-RPM and competition engines
• Daily driver maintenance and durability enhancement for classic and modern Holden vehicles