B58 Cylinder Head Service by 5150 AutoSport

5150 AutoSport Performance Cylinder Head Services for BMW Toyota B58 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 B58 Gen 1 Applications:

1 Series

2016-2019     F20/F21     M140i

2 Series

2016-2019     F22/F23     M240i

3 Series

2015-2019     F30/F31     340i / 340i xDrive
2016-2019     F34     340i GT / 340i GT xDrive

4 Series

2016-2020     F32/F33/F36     440i / 440i xDrive

5 Series

2016-2019     G30/G31     540i / 540i xDrive

6 Series

2017-2019     G32     640i GT / 640i GT xDrive

7 Series

2015-2019     G11/G12     740i / 740i xDrive

X3 Series

2017-2019     G01     X3 M40i

X4 Series

2018-2019     G02     X4 M40i

BMW B58 Gen 2 Applications:

2 Series

2022-Present     G43     M240i / M240i xDrive

3 Series

2019-Present     G20/G21     M340i / M340i xDrive

4 Series

2020-Present     G22/G23/G26     M440i / M440i xDrive

Z Series

2019-Present     G29     Z4 M40i

5 Series

2020-Present     G30/G31 LCI     540i / 540i xDrive

6 Series

2020-Present     G32 LCI     640i GT / GT 640i xDrive 

7 Series

2019-Present     G11/G12 LCI     740i / 740i xDrive

X3 Series

2020-Present     G01     X3 M40i

X4 Series

2020-Present     G02     X4 M40i

X5 Series

2018-Present     G05     X5 xDrive40i

X6 Series

2019-Present     G06     X6 xDrive40i

X7 Series

2018-Present     G07     X7 xDrive40i

ALPINA B58 Gen 2 Applications:

B3 Series

2020-Present     G20/G21     B3

B4 Series

2022-Present     G22     B4

B5 Series

2020-Present     G30     B5

XB7 Series

2020-Present     G07     XB7

Toyota B58 Gen 2 Applications:

A90 / A91 Supra

2020-Present     GR Supra 3.0    
2020-Present     GR Supra 3.0 Premium    
2021-Present     GR Supra 3.0 A91 Edition