Product Description
Mangum Racing CNC Ported Brodix 267cc LS3 Cylinder Heads
Deck Milling Available (email Sales@michiganmotorsports.com prior to ordering)
Mangum Racing CNC Ported Brodix 15° LS3 Cylinder Heads
Built from Brodix 6-bolt LS3 castings with extra deck thickness, Mangum Racing's 15° LS3 heads are designed for serious naturally aspirated and boosted combinations that demand airflow, strength, and repeatability.
Each set is fully CNC ported in-house with brand new Centroid 5 axis cnc mills, and Newen seat & guide machines. Every set of cylinder heads will then be hand blended & carefully inspected before final assembly.
With a 267cc CNC intake runner and optimized 96cc exhaust port, these heads deliver strong mid-lift numbers with excellent high-lift stability — making them ideal for aggressive hydraulic roller street & race builds needing to retain the stock valve locations & angles.
Premium Hardware & Construction
- 6-bolt Brodix LS3 casting with increased deck thickness
- 15° valve angle, OEM LS3 valve spacing
- 2.165” hollow stem stainless intake valves
- 1.600” hollow stem stainless exhaust valves
- Bronze guides
- PAC .660” dual spring package
- Titanium retainers
- Viton seals
- 1.250” steel spring seats
- 68.5cc CNC chambers (milling available at no charge)
- Chamber softening available ($50)
- 1/2" head stud hole upgrade available ($50)
- Flat milling at .006” per cc available
- Minimum bore: 4.000”
- Sold/Priced as a Pair
Designed for Builders Who Care About the Details
These are not mass-produced heads. Each set is machined, assembled, hand blended, and inspected in small batches to maintain strict quality control and dimensional consistency.
Extra deck thickness adds durability for higher cylinder pressure combinations. The PAC .660” dual spring setup provides valvetrain stability for serious cam profiles. Stock pushrod length works in most applications but should always be verified based on camshaft and final milling.
If you’re building a combination needing to stay stock valve angles & locations then this cylinder head is hard to beat!
