M30 Cylinder Head Service by 5150 AutoSport

5150 AutoSport Performance Cylinder Head Services for BMW M30 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.

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 M30B30 Applications:

BMW New Six Line

1971-1977     E3     2500 / 2800
1971-1977     E3     3.0S / 3.0Si

1971-1975     E9     3.0CS / 3.0CSi

BMW 5 Series

1975-1978     E12     530i [North America]

1976-1979     E24     630CSi

BMW 7 Series

1977-1979     E23     730

BMW M30B34 Applications:

BMW 5 Series

1982-1987     E28     533i / 535i / 535is

BMW 6 Series

1978-1984     E24     633CSi [North America]
1985-1987     E24     635CSi

BMW 7 Series

1979-1986     E23     733i / 735i

1986-1992     E32     735i / 735iL

BMW M30B35 Applications:

BMW 5 Series

1985-1988     E28     535i / 535is

1988-1993     E34     535i

BMW 6 Series

1987-1989     E24     635CSi
1987-1989     E24     M6 [North America]

BMW 7 Series

1979-1986     E23     733i / 735i

1986-1992     E32     735i / 735iL