5150 AutoSport Performance Cylinder Head Services for BMW N20 N26 Engines
Please note that price is based on customer providing core. If you need help sourcing a core, please contact our sales team.
Investing in a performance cylinder head service is crucial for optimizing engine potential in performance builds. We offer three levels of service to meet your budget and build goals, from OEM refresh to full race-level machining:
Stage 1 – OEM Refresh (Rebuild & Reliability Focused)
Ideal for stock or mildly modified engines needing a proper refresh.
The cylinder head is fully disassembled, cleaned, and soda blasted to remove carbon and contaminants. Valve guides are measured and inspected, with new guides installed if needed, then precision reamed and honed for proper clearance. A 5-angle valve job is performed to restore sealing efficiency, followed by resurfacing to ensure a flat, true mating surface. New Viton valve seals are installed, the head is fully reassembled using OEM valves, guides, springs, and retainers, and pressure tested after assembly.
Optional service upgrade: add a high-performance valve spring kit.
Stage 1 at a Glance:
- Disassemble and Clean
- Soda Blast
- Inspect and Measure Valve Guides
- Removal and Installation of new Guides, if necessary
- Ream and Hone Valve Guides
- 5-Angle Valve Job
- Resurfacing
- Final Wash
- Install New Viton Valve Seals
- Setting of Seat Pressure
- Full Reassembly
- Pressure Testing after assembly
Stage 2 – Performance Valvetrain Upgrade
For higher RPM builds and increased durability.
Includes everything from Stage 1, plus upgraded high-performance valves, a high-performance valve spring kit, and new valve locks/keepers. This stage improves valvetrain stability, reduces the risk of valve float, and prepares the head for more aggressive use while retaining OEM-style machining processes.
Stage 2 at a Glance:
- Disassemble and Clean
- Soda Blast
- Removal of OEM Valve Guides
- Installation of Performance Valve Guides
- Ream and Hone Valve Guides
- 5-Angle Valve Job
- Resurfacing
- Final Wash
- Install New Viton Valve Seals
- Install New High Performance Valve Spring Kit
- Install New High Performance Valve Kit
- Install New High Performance Valve Keepers
- Setting of Seat Pressure
- Full Reassembly
- Pressure Testing after assembly
Pro-Xtreme – All-Out Performance Cylinder Head Service
Designed for high-horsepower, forced-induction, and competition builds.
The cylinder head undergoes complete disassembly, cleaning, and in-depth inspection, including crack, leak, and pressure testing. Factory valve guides are replaced with high-performance guides, then precision reamed and honed for extreme heat and RPM stability.
CNC multi-angle porting is performed on both intake and exhaust ports to improve airflow consistency across all cylinders. A CNC multi-angle intake valve job and radius exhaust valve job optimize flow into and out of the combustion chamber. Valves are unshrouded to further enhance airflow, and preventative chamfering is applied in critical areas to reduce stress concentrations.
The mating surface is trueness checked, resurfaced, and verified again for perfect sealing. After machining, the head is thoroughly washed and assembled using balanced and blueprint-matched high-performance valves, along with balanced valve springs and retainers for precise valve control and long-term durability.
Pro-Xtreme at a Glance:
- Disassemble and Clean
- Soda Blast
- Removal of OEM Valve Guides
- Installation of Performance Valve Guides
- Ream and Hone Valve Guides
- 5-Axis CNC Intake Porting
- 5-Axis CNC Exhaust Porting
- CNC Combustion Chamber Modification
- 5-Angle CNC Intake Valve Job
- 5-Angle CNC Exhaust Valve Job
- Unshrouding of Valves
- Preventative Chamfering in Potential Problem Areas
- Trueness Checking of Mating Surface
- Resurfacing
- Final Wash
- Install New Viton Valve Seals
- Install New High Performance Valve Spring Kit
- Install New High Performance Valve Kit
- Install New High Performance Valve Keepers
- Setting of Seat Pressure
- Full Reassembly
- Pressure Testing after Assembly
Read more about our Pro-Xtreme service here.
BMW N20 Applications:
1 Series
2011-2015 F20/F21 116i / 118i / 120i / 125i
2 Series
2014-2016 F22/F23 220i / 228i
3 Series
2012-2016 F30/F31 320i / 328i
2013-2016 F34 320i / 328i GT
4 Series
2013-2016 F32/F33 420i / 428i
5 Series
2011-2017 F10/F11 520i / 528i
2011-2017 F07 520i / 528i GT
X1 Series
2012-2017 E84 X1 sDrive20i / xDrive20i / xDrive28i
X3 Series
2012-2017 F25 X3 sDrive20i / xDrive20i / xDrive28i
X4 Series
2014-2016 F26 X4 xDrive20i / xDrive28i
X5 Series
2013-2014 F15 X5 xDrive25i / xDrive28i
Z Series
2011-2016 E89 Z4 sDrive20i / sDrive28i
BMW N26 Applications:
3 Series
2013-2016 F30/F31 320i / 328i / 328i xDrive
2014-2016 F34 328i / 328i xDrive GT
4 Series
2014-2016 F32/F33 428i / 428i xDrive
2014-2016 F36 428i / 428i xDrive Gran Coupe
5 Series
2012-2016 F10 528i / 528i xDrive
X1 Series
2013-2015 E84 X1 xDrive28i
X3 Series
2013-2017 F25 X3 xDrive28i