Milwaukee-Eight Cylinder Head Porting Packages
Choose the CNC‑ported M8 head that matches your build. From +1MM street performance to +4MM full‑race, every package is precision machined and flow‑bench tested.
M8 +1MM OVERSIZED (Gen. 1)
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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
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For HD M8 Oil Cooled and Twin Cooled Models.
M8 +2MM OVERSIZED (Gen. 1)
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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
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For HD M8 Oil Cooled and Twin Cooled Models.
M8 +4MM OVERSIZED (Gen. 1)
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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
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For HD M8 Oil Cooled Heads (Not available for twin cooled heads).
Starting at $3,402.18
CENTER-COOLED M8 +2MM OVERSIZED (Gen. 2)
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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
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For 2023.5 model year and up.
For Center-Cooled M8 heads only (Non SE).
Starting at $2,039.89
Starting at $2,694.06
Starting at $2,463.69
SE CENTER-COOLED M8 +2MM OVERSIZED (Gen. 2)
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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
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For 2024 model year and up.
For SE Center-Cooled M8 heads only.
Starting at $2,067.64
SE CENTER-COOLED M8 +4MM OVERSIZED (Gen. 2)
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Disassembly, Inspection, and Cleaning
+4MM Oversized Valves (Steel or Titanium Options)
Extensive 5-Axis CNC Porting
New Bronze Intake & Exhaust Seats
New Bronze Valve Guides (Intake & Exhaust)
Multi-Angle Competition Valve Job
2” Exhaust Port Modification (Required)
Re-Machined Head Gasket Surface
Titanium .640” Lift Valve Spring Kit
Precision Assembled & Tested
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For 2024 model year and up.
For SE Center-Cooled M8 heads only.
S&S MK136 M8 +2MM OVERSIZED
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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
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For S&S MK136 M8 style heads only.
Starting at $3,272.52
Starting at $2,135.63