Speedmaster PCE281.1654 Mopar Chrysler SB 318 340 360 170cc 65cc Aluminum Bare Cylinder Head

The Speedmaster PCE281.1654 is a high-flow aluminum bare cylinder head designed for Mopar Chrysler small-block (SB) engines, including the 318, 340, and 360 displacement variants. This precision-engineered casting features a 170cc intake port and 65cc combustion chamber, delivering improved airflow and performance characteristics ideal for street and race applications requiring enhanced cylinder head efficiency.

As a bare aluminum casting, this cylinder head arrives without valves, springs, or rocker components, making it the foundation for custom engine builds and high-performance restorations. The aluminum construction provides weight savings and superior thermal properties compared to cast iron alternatives. This head is compatible with Mopar small-block mounting and intake patterns, and is suitable for rebuilds, engine swaps, and performance upgrades on classic and muscle car platforms.

Key Features & Benefits

• Aluminum Construction: Lightweight bare casting reduces engine weight while improving heat dissipation in SB applications.
• 170cc Intake Runners: High-flow intake ports enhance cylinder filling and combustion efficiency across the RPM range.
• 65cc Combustion Chamber: Precision chamber volume optimizes compression and flame propagation for consistent performance.
• Mopar SB Compatible: Direct fit for Chrysler 318, 340, and 360 small-block engines with factory mounting patterns.
• Bare Head Format: Ships without valves, springs, or rocker arms, allowing custom valve train selection and tuning.

Specifications

Ideal Applications

• Street rod and muscle car engine builds requiring lightweight performance heads
• Mopar small-block engine rebuilds and restorations on classic Chrysler platforms
• High-performance racing applications demanding improved airflow and thermal efficiency
• Engine swap projects using Chrysler SB powerplants in custom vehicles