CNC ported Harley-Davidson M8 cylinder head with +1mm oversized valves for improved airflow and street performance.

M8 +1MM OVERSIZED (Gen. 1)

    • Disassembly, Inspection, and Cleaning

    • +1MM Oversized Stainless Steel Valves

    • Extensive 5-Axis CNC Porting

    • Multi-Radius Competition Valve Job

    • Performance Bronze Valve Guides

    • New Valve Stem Seals

    • Re-Machined Head Gasket Surface

    • Weld Cooling Passage Hole

    • High-Lift Spring Kit (.640" lift) (Steel or Titanium Options)

    • Precision Assembled & Tested

    • For HD M8 Oil Cooled and Twin Cooled Models.

Starting at $2,039.89

High-performance M8 cylinder head CNC ported with +2mm oversized valves for enhanced CFM and power output.

M8 +2MM OVERSIZED (Gen. 1)

    • Disassembly, Inspection, and Cleaning

    • +2MM Oversized Valves (Steel or Titanium Options)

    • Extensive 5-Axis CNC Porting

    • Multi-Radius Competition Valve Job

    • Performance Bronze Intake & Exhaust Valve Seats

    • New Valve Stem Seals

    • CNC Combustion Chamber Modifications

    • Weld Cooling Passage Hole

    • Re-Machined Head Gasket Surface

    • High-Lift Spring Kit (.640" lift) (Steel or Titanium Options)

    • Precision Assembled & Tested

    • For HD M8 Oil Cooled and Twin Cooled Models.

Starting at $2,694.06

Race-spec M8 head CNC ported for +4mm oversized valves, designed for maximum horsepower and flow at high RPM.

M8 +4MM OVERSIZED - FULL RACE (Gen. 1)

    • Disassembly, Inspection, and Cleaning

    • +4MM Oversized Valves (Steel or Titanium Options)

    • Bronze Intake & Exhaust Seats

    • Performance Bronze Valve Guides

    • New Valve Stem Seals

    • Extensive 5-Axis CNC Porting

    • 70mm Square Intake Port Modification

    • 2" Exhaust Flange Modification

    • Reshaped CNC Combustion Chamber

    • Multi-Radius Competition Valve Job

    • .640" Titanium High-Lift Spring Kit

    • Weld Cooling Passage Hole

    • Re-Machined Head Gasket Surface

    • Professional Assembly & Testing

    • For HD M8 Oil Cooled Heads (Not available for twin cooled heads).

Starting at $3,127.18

Center-cooled Milwaukee-Eight head CNC ported with +2mm valves for optimal heat management and performance.

CENTER-COOLED M8 +2MM OVERSIZED (Gen. 2)

    • Disassembly, Inspection, and Cleaning

    • +2MM Oversized Valves (Steel or Titanium Options)

    • Extensive 5-Axis CNC Porting

    • Bronze Intake Valve Seats (Stock Exhaust Seats Retained)

    • New Bronze Valve Guides (Intake & Exhaust)

    • Multi-Radius Competition Valve Job

    • Full CNC-Machined Combustion Chamber

    • Plug and Weld Cooling Passage Hole

    • Re-Machined Head Gasket Surface

    • High-Lift Spring Kit (.640" lift) (Steel or Titanium Options)

    • Precision Assembled & Tested

    • For 2023.5 model year and up.

    • For Center-Cooled M8 heads only (Non SE).

Starting at $2,463.69

Screamin’ Eagle center-cooled M8 head with Ward Performance +2mm porting for top-tier street and race applications.

SE CENTER-COOLED M8 +2MM OVERSIZED (Gen. 2)

    • Disassembly, Inspection, and Cleaning

    • +2MM Oversized Valves (Steel or Titanium Options)

    • Extensive 5-Axis CNC Porting (Reshaped Intake & Exhaust Ports)

    • Multi-Radius Competition Valve Job

    • New Bronze Valve Guides (Intake & Exhaust)

    • New Valve Stem Seals

    • Plug and Weld Cooling Passage Hole

    • Re-Machined Head Gasket Surface

    • High-Lift Spring Kit (.640" lift) (Steel or Titanium Options)

    • Precision Assembled & Tested

    • For 2024 model year and up.

    • For Center-Cooled M8 heads only.

Starting at $2,067.64

S&S MK136 M8 cylinder head precision CNC ported by Ward Performance with +2mm valves for superior airflow.

S&S MK136 M8 +2MM OVERSIZED

    • Disassembly, Inspection, and Cleaning

    • +2MM Oversized Valves (Steel or Titanium Options)

    • Extensive 5-Axis CNC Porting (Reshaped Intake & Exhaust Ports)

    • Multi-Radius Competition Valve Job

    • Full CNC-Machined Combustion Chamber

    • New Bronze Valve Guides (Intake & Exhaust)

    • New Valve Stem Seals

    • Re-Machined Head Gasket Surface

    • High-Lift Spring Kit (.640" lift) (Steel or Titanium Options)

    • Precision Assembled & Tested

    • For S&S MK136 M8 style heads only.

Starting at $2,135.63