Product Description
Mangum Racing CNC Ported 273cc LS7 Cylinder Heads
Deck Milling Available (email Sales@michiganmotorsports.com prior to ordering)
Built from the Qualcast stock style replacement LS7 casting, the Mangum Racing 273 program is designed for high-rpm, large-displacement LS combinations that demand elite airflow and structural integrity.
Featuring a 12° valve angle and OEM LS7 valve spacing/valve length, this 6-bolt casting delivers exceptional port efficiency while maintaining compatibility with LS7-based platforms. With a 273cc CNC intake runner and optimized 93cc exhaust port, this cylinder head is engineered for serious naturally aspirated builds and high-output boosted applications where the customer wants a near bolt on cylinder head.
Each set is fully CNC machined in-house on a Centroid 5-axis machining centers and finished on Newen seat and guide equipment. Every head is hand blended, assembled, and inspected in small batches to ensure dimensional accuracy and repeatable performance.
Premium Hardware & Construction
- 6-bolt Qualcast LS7 casting
- 12° valve angle with OEM LS7 valve spacing
- 273cc CNC intake port
- 93cc exhaust port
- 70.5cc CNC combustion chambers (milling available at no charge)
- 2.200” titanium intake valves
- 1.610” stainless exhaust valves
- Bronze CHE guides
- PAC .660” dual spring package
- Titanium retainers
- Viton seals
- 1.250” steel spring seats
- Chamber softening available ($50)
- 1/2" head stud hole upgrade available ($50)
- Flat milling at .006” per cc
- Minimum bore: 4.100”
- Sold/Priced as a Pair
Designed for LS7 Street & Strip Builds
With airflow over 390 CFM at .700” lift, the Mangum Racing 273 LS7 is capable of supporting serious naturally aspirated horsepower in 427+ cubic inch combinations.
Stock pushrod length works in many applications but should always be verified based on camshaft selection and final milling.
