Mangum Racing 273cc LS7 Cylinder Heads

The Mangum Racing CNC Ported 273cc LS7 Cylinder Heads are designed for high-performance LS7 combinations requiring increased airflow, durability, and consistent valvetrain performance. Built around a 12° valve angle and OEM LS7 geometry, these 6-bolt cylinder heads maintain factory-style intake and exhaust port locations while providing substantially increased airflow capability.

A fully CNC-ported 273cc intake runner and optimized 93cc exhaust port provide strong mid-lift and high-lift airflow for aggressive naturally aspirated and forced-induction LS7 combinations.

KEY FEATURES

• 6-Bolt LS7 Cylinder Head Casting
• 273cc CNC-Ported Intake Runners
• 93cc Exhaust Ports
• 12° Valve Angle
• OEM LS7 Valve Spacing
• Stock Intake and Exhaust Port Locations
• 2.200″ Titanium Intake Valves
• 1.610″ Stainless Steel Exhaust Valves
• Bronze Valve Guides
• PAC .660″ Dual Valve Springs
• Titanium Retainers
• Viton Valve Seals
• 1.250″ Steel Spring Seats
• Center-Bolt Valve Cover Pattern

CYLINDER HEAD SPECIFICATIONS

• Intake Runner Volume: 273cc
• Exhaust Port Volume: 93cc
• Combustion Chamber: 70.5cc
• Valve Angle: 12°
• Intake Valve: 2.200″ Titanium
• Exhaust Valve: 1.610″ Stainless Steel
• Minimum Bore Size: 4.100″
• Flat Milling: .006″ per cc
• Head Bolt Configuration: 6-Bolt, OE or LS Bolt Compatible
• Milling available at no additional charge

AIRFLOW PERFORMANCE

Flow testing was performed on a SuperFlow SF-1020 with a 4.125″ bore plate. Intake figures were tested with a radius entry and exhaust figures without a pipe.

HIGH-PERFORMANCE LS7 APPLICATIONS

With intake airflow reaching 393 CFM at .700″ lift, the Mangum Racing 273cc LS7 cylinder heads are suited for aggressive street and strip combinations, including high-RPM naturally aspirated engines and high-output forced-induction applications.

Note: Pushrod length can vary based on camshaft selection, valvetrain components, and cylinder head milling. Proper pushrod length should always be measured and verified during installation.