Speedmaster PCE281.2082.03 BBC Assembled Cylinder Heads Intake Chamber - 454 360cc 115cc

The Speedmaster PCE281.2082.03 assembled cylinder heads are engineered for big block Chevy 454 applications requiring serious airflow and power potential. These gravity die-cast aluminum heads feature 360cc intake ports and 115cc combustion chambers, positioned as a high-performance option for engines targeting 750+ horsepower with proper supporting components.

Cylinder Head Specifications:

• Intake port volume: 360cc for maximum airflow capability
• Combustion chamber volume: 115cc
• Valve sizes: 2.250" intake / 1.880" exhaust
• Maximum valve lift: .600"
• Coil bind: .740"
• Port configuration: Rectangle port design for high-output engines
• Gravity die-cast construction for consistent strength and density

Assembled Valvetrain Components:

• Hydraulic roller compatible valvetrain
• Intake valve spring install height: 145 lbs
• Exhaust valve spring install height: 145 lbs
• Closed seat pressure: 145 lbs
• Open seat pressure: 360 lbs
• Competition-grade valve job for optimal flow

Application Notes:

• Designed for big block Chevy 454 and similar displacement engines
• Best suited for engines producing 750+ horsepower
• Large 360cc intake ports bridge the gap between street performance and all-out racing heads
• Rectangle port design optimized for engines over 500 horsepower
• Compatible with engines up to approximately 540 cubic inches and 7000 RPM

Installation Recommendations:

• Multi-layer steel (MLS) head gaskets recommended due to large valve combustion chamber design
• Speedmaster PCE348.1004 MLS head gaskets (.041" thick) are the factory-recommended gasket for these heads
• Large 2.250"/1.880" valves require proper combustion chamber clearance verification

These fully assembled cylinder heads arrive ready to install with valves, springs, retainers, and keepers already in place, saving time during engine assembly. The gravity die-cast process creates a uniform, dense aluminum structure that provides consistent performance and durability under high-stress conditions. The 360cc intake port volume makes these heads an excellent choice for serious street/strip builds and racing applications where maximum airflow is essential.