Speedmaster PCE281.2035 BBC 396 Aluminum Cylinder Heads 305cc 119cc Assembled

The Speedmaster PCE281.2035 assembled aluminum cylinder heads are designed for big block Chevy 396 engines seeking reliable performance in the 400-500+ horsepower range. These gravity die-cast cylinder heads feature 305cc intake runners and 119cc combustion chambers, providing an optimal balance of airflow velocity and power delivery for street and performance applications.

Cylinder Head Specifications:

• Intake runner volume: 305cc with oval port configuration
• Combustion chamber volume: 119cc
• Valve sizes: 2.250" intake / 1.880" exhaust
• Maximum valve lift: 0.580"
• Coil bind: 0.740"
• Designed for solid flat tappet camshafts

Valvetrain Specifications:

• Valve spring install height: 1.8" (both intake and exhaust)
• Install pressure: 130 lbs at 1.8"
• Closed seat pressure: 125 lbs
• Open seat pressure: 320 lbs
• Fully assembled and ready to install

Construction and Design:

• Gravity die-cast aluminum construction for superior strength and consistency
• Oval intake ports optimize air velocity for engines under 540 cubic inches
• Ideal for applications running under 7,000 RPM
• Large valve sizes require consideration of head gasket selection

The smaller cross-section oval intake ports on these heads are engineered to increase incoming air velocity, which translates to improved throttle response, stronger mid-range torque, and better fuel economy compared to larger rectangle port designs. This makes the PCE281.2035 heads an excellent choice for street performance builds, hot rods, and weekend cruisers where drivability is as important as power output. The gravity die-casting process creates a more uniform grain structure in the aluminum, resulting in a stronger and more durable cylinder head compared to traditional sand-cast methods.

These heads come fully assembled with valves, springs, retainers, and locks installed, simplifying the installation process. Due to the large valve diameters and wide combustion chambers, proper head gasket selection is critical for optimal sealing and performance.