Mangum Racing 273cc LS7 Cylinder Heads

Mangum Racing 273cc LS7 Cylinder Heads

Mangum Racing CNC Ported 273cc LS7 Cylinder Heads

The Mangum Racing 273cc LS7 Cylinder Heads are built for high-performance LS7 combinations that demand serious airflow, durability, and repeatable results. Designed around a 12° valve angle and OEM LS7 geometry, these heads offer exceptional efficiency while maintaining compatibility with factory-style LS7 setups.

Featuring a fully CNC-ported 273cc intake runner and optimized 93cc exhaust port, this package delivers strong mid-lift performance with excellent high-lift airflow—making it ideal for aggressive naturally aspirated builds as well as high-output boosted combinations.

Each set is precision machined and assembled with premium components to ensure consistent performance, durability, and proper valvetrain control in demanding street and race applications.

Airflow Performance

Tested on a SuperFlow SF-1020 flow bench with a 4.125” bore plate

Intake Flow (Radius Entry)

• .200” – 160 CFM
• .300” – 255 CFM
• .400” – 313 CFM
• .500” – 355 CFM
• .600” – 382 CFM
• .700” – 393 CFM

Exhaust Flow (No Pipe)

• .200” – 117 CFM
• .300” – 160 CFM
• .400” – 209 CFM
• .500” – 224 CFM
• .600” – 235 CFM
• .700” – 247 CFM

With nearly 400 CFM of intake airflow at high lift, these heads deliver excellent power potential across the RPM range, supporting both high-revving naturally aspirated builds and forced induction applications.

Specifications & Features

• 6-bolt LS7 casting
• 12° valve angle
• OEM LS7 valve spacing
• 273cc CNC intake port volume
• 93cc exhaust port volume
• 70.5cc combustion chambers (milling available at no extra charge)
• 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
• Minimum bore size: 4.100”
• Flat milling: .006” per cc (no extra charge)
• 6-bolt head bolt configuration (OE or LS bolt compatible)
• Center bolt valve cover pattern

Built for High-Performance LS7 Applications

The Mangum Racing 273cc LS7 heads are engineered for serious street and strip builds where airflow, strength, and consistency matter. Whether you're building a large cubic inch naturally aspirated setup or a high-boost combination, these heads provide the airflow and durability needed to support your goals.

Note: Pushrod length may vary depending on camshaft selection and any cylinder head milling. Proper measurement is always recommended during installation.