Speedmaster PCE281.1476 LS3 L92 L76 270cc CNC Aluminum Cylinder Head

The Speedmaster PCE281.1476 is a fully CNC-machined bare aluminum cylinder head designed for Chevy GM LS3, L92, and L76 engines. Engineered for serious performance enthusiasts, this head features 270cc intake runners and 71cc combustion chambers, offering excellent flow characteristics for high-performance street and race applications.

Key Features:

• 270cc CNC-ported intake runners for superior airflow
• 71cc combustion chambers for optimized compression ratios
• Full CNC machining ensures precise tolerances and consistent performance
• Gravity cast aluminum construction for strength and durability
• Compatible with LS3, L92, and L76 Gen III/IV LS engines
• Rectangular port design for maximum flow potential
• Sold as bare head (valvetrain components not included)

Technical Notes:

This head uses LS3/L76/L92 style rectangular intake ports and requires GM part #12590125 O-ring seals for intake manifold mounting. Exhaust side gaskets use standard LS MLS header gaskets (GM #12901125). This is a bare casting and does not include valves, springs, retainers, or other valvetrain components.

The Speedmaster LS cylinder head line offers performance-minded builders a cost-effective alternative to OEM castings while maintaining quality through their gravity casting process, which creates more uniform and robust castings compared to traditional methods.