Speedmaster PCE281.2082.01 BBC Aluminum Cylinder Heads 360cc 115cc Hydraulic Flat Tappet

The Speedmaster PCE281.2082.01 aluminum cylinder heads are fully assembled, high-performance heads designed for Big Block Chevrolet 454 engines. Featuring 360cc rectangular intake ports and 115cc combustion chambers, these heads are engineered to deliver exceptional airflow for engines producing over 500 horsepower while maintaining excellent mid-range power characteristics.

Key Specifications:

• Combustion chamber volume: 115cc
• Intake runner volume: 360cc rectangular port
• Exhaust port: Rectangular, standard location
• Intake valve diameter: 2.250 inches
• Exhaust valve diameter: 1.880 inches
• Maximum valve lift: 0.600 inches
• Valve spring coil bind: 0.740 inches
• Closed seat pressure: 120 lbs
• Open seat pressure: 320 lbs
• Cylinder head material: Gravity die-cast aluminum

Complete Assembly Includes:

• Premium intake and exhaust valves installed
• Dual valve springs with dampers (1.450-inch OD)
• Chromoly steel retainers with 10-degree locks
• Positive stop valve stem seals
• Valve guides pressed and installed
• Ready to install—no additional machining required

Performance Applications:

• Ideal for engines under 540 cubic inches and 7,000 RPM
• Designed for hydraulic flat tappet camshafts
• Excellent choice for 500+ horsepower street/strip builds
• Works with standard intake port gaskets

Technical Notes:

• Gravity die-cast construction provides superior strength and uniformity compared to conventional casting methods
• 360cc intake ports bridge the gap between entry-level performance heads and all-out racing heads
• Requires 14mm x 3/4-inch reach, 5/8-inch hex gasket seat spark plugs
• Compatible with Speedmaster PCE348.1004 MLS head gaskets (0.041-inch thick) or Felpro 1017 gaskets
• Fits Mark IV and Mark VI blocks; special gaskets required for Mark V blocks
• Perimeter bolt valve cover mounting style

These fully assembled cylinder heads arrive ready to bolt on, eliminating the time and expense of sourcing individual valvetrain components and having machine work performed. The larger 360cc intake ports provide increased airflow capacity for big-displacement builds while maintaining good port velocity for strong low-to-mid range torque production.