Product Description
Mangum Racing CNC Ported 229cc LS1 Cylinder Heads
Fits 3.780"+ Bore Cathedral Port Engines 4.8L 5.3L 5.7L 6.0L
4-Bolt Casting | 62cc Chamber | Priced/Sold as a Pair
Built from their own high strength castings featuring increased deck thickness, the Mangum Racing 15° LS1 is engineered for serious naturally aspirated and boosted combinations that demand airflow, strength, and repeatability - while maintaining OEM valve angle and valve location geometry.
Featuring a 2.02/1.57 valve combo, this 229cc version easily clears the bores on 4.8L/5.3L engines as well as working great on larger displacements! This is not a simple LS6 cylinder head copy, this is a ground-up designed cylinder head with fully cnc ported ports & chambers for optimum power & performance.
This casting is designed to support 1,500+ horsepower combinations when paired with the proper short block and induction system, making it an ideal solution for builders who need maximum performance without moving away from stock valve layout.
Each set is fully CNC ported in-house on a new Centroid 5-axis machining centers and finished on Newen seat and guide equipment. Every cylinder head is hand blended, inspected, and assembled in small batches to ensure dimensional accuracy and consistency.
With a 229cc CNC intake runner and optimized 97cc exhaust port, the MR 15° delivers strong mid-lift efficiency and stable high-lift airflow, ideal for smaller bore 3.780"-4.000" LS engines.
Premium Hardware & Construction
- 4-bolt Mangum Racing LS1 casting with increased deck thickness
- 15° valve angle with OEM LS valve spacing
- 2.02" stainless intake valves
- 1.57" stainless exhaust valves
- Bronze guides
- PAC .650" dual spring package (PAC 1207x Springs Optional)
- Titanium retainers
- Viton seals
- 1.250” steel spring seats
- 62cc CNC chambers (milling available at no charge)
- Chamber softening available ($75)
- 1/2" head stud hole upgrade available ($75)
- Flat milling at .007” per cc available
- Minimum bore: 3.780”
- 4.030" Minimum Gasket Bore
- Sold/Priced as a Pair
If deck milling or different valve springs are desired, please email sales@michiganmotorsports.com prior to ordering.
