Speedmaster PCE261.1117 Oldsmobile 330 350 400 425 455 1.65 Ratio Aluminum Rocker Arms with Hardware

The Speedmaster PCE261.1117 is a set of aluminum rocker arms engineered for Oldsmobile V8 engines including the 330, 350, 400, 425, and 455 cubic-inch displacement models. These rocker arms feature a 1.65 ratio and 7/16" stud size, delivering reliable valve actuation and reduced reciprocating mass for improved engine response. Constructed from lightweight aluminum, they provide both durability and performance benefits in street and competition applications.

Designed as a complete bolt-on solution, this set includes all necessary mounting hardware for straightforward installation on compatible Oldsmobile engines. The 1.65 rocker ratio increases valve lift relative to camshaft lift, allowing for more aggressive valve timing characteristics and enhanced cylinder filling. Whether rebuilding a classic Oldsmobile engine or upgrading an existing setup, these rocker arms offer a direct factory-replacement or performance-upgrade option that maintains OEM compatibility while improving efficiency and throttle response.

Key Features & Benefits

• Aluminum Construction: Lightweight material reduces reciprocating mass for improved engine efficiency and responsiveness.
• 1.65 Rocker Ratio: Increases valve lift and allows for more aggressive valve timing on Oldsmobile V8 engines.
• 7/16" Stud Size: Compatible with standard Oldsmobile 330, 350, 400, 425, and 455 engine valve trains.
• Complete Hardware Kit: Includes all fasteners and mounting components needed for installation.
• Multi-Engine Compatibility: Fits Oldsmobile 330, 350, 400, 425, and 455 cubic-inch displacement engines.

Specifications

Ideal Applications

• Classic Oldsmobile engine rebuild and restoration projects
• Performance upgrade for Oldsmobile V8 street engines
• Engine swap and compatibility conversion
• Valve train replacement and maintenance