Image 1 of 4
Image 2 of 4
Image 3 of 4
Image 4 of 4
M8 Precision CNC Head Machining & Porting Gen 1
Weld and CNC Deck – Ship your heads in for oil/coolant hole TIG repair followed by precision CNC decking.
Stage 1 Head Service includes TIG welding of oil and/or coolant holes, CNC decking, full disassembly, bronze taper guide replacement for improved port velocity, pocket porting with properly sized throat diameter, a performance 4-angle valve job, and new valve springs set up for your cam choice. This combination can deliver a notable airflow increase—an excellent option for budget big-bore builds or stock rebuilds looking for a solid bump in power. Please include a note with cam specs when shipping.
Stage 2 Head Service includes everything from our Stage 1 package—TIG welding of oil/coolant holes, CNC decking, bronze taper guide replacement, pocket port throat setup, a performance 4-angle valve job, and springs matched to your cam—but adds full CNC porting and +1mm oversized valves for a major increase in airflow and power. Chamber volume on Stage 2 heads is set to 90-92cc. This is an excellent option for high-output big-bore builds. Please include cam specs when shipping.
Stage 3 Head Service includes everything from our Stage 2 package—TIG welding, CNC decking, bronze taper guides, pocket port throat setup, a performance 4-angle valve job, springs matched to your cam, and full CNC porting—but upgrades to +1.5mm oversized valves. This larger valve setup tightens the chamber volume to 89cc, making it ideal for flat-top and dished-piston “box big bore kits.” It’s also a great option for hot-rod builds when the full 2mm valve head package is outside the budget. Please include cam specs when shipping.
Stage 4 Head Service is our race-inspired +2mm valve package featuring full CNC porting for maximum airflow and top-end performance. Chamber volume is set to 90-92cc, making this head ideal for high-compression big-inch and high-RPM builds. This is the same head we have used time and time again on our 170+ HP 124/128” combinations. It is our highest-flowing Milwaukee-Eight head option and the foundation for true race-level power. Please include cam specs when shipping.
Please Note:
This service is performed on customer-supplied castings. If your heads arrive damaged, we are not responsible; we will document and send photos immediately upon receipt. Please over-pack and protect your parts when shipping to ensure they arrive safely.
weld and deck is 1 working week turn around time
All porting services are 1-3 working weeks depending on work load constantly varying
Weld and CNC Deck – Ship your heads in for oil/coolant hole TIG repair followed by precision CNC decking.
Stage 1 Head Service includes TIG welding of oil and/or coolant holes, CNC decking, full disassembly, bronze taper guide replacement for improved port velocity, pocket porting with properly sized throat diameter, a performance 4-angle valve job, and new valve springs set up for your cam choice. This combination can deliver a notable airflow increase—an excellent option for budget big-bore builds or stock rebuilds looking for a solid bump in power. Please include a note with cam specs when shipping.
Stage 2 Head Service includes everything from our Stage 1 package—TIG welding of oil/coolant holes, CNC decking, bronze taper guide replacement, pocket port throat setup, a performance 4-angle valve job, and springs matched to your cam—but adds full CNC porting and +1mm oversized valves for a major increase in airflow and power. Chamber volume on Stage 2 heads is set to 90-92cc. This is an excellent option for high-output big-bore builds. Please include cam specs when shipping.
Stage 3 Head Service includes everything from our Stage 2 package—TIG welding, CNC decking, bronze taper guides, pocket port throat setup, a performance 4-angle valve job, springs matched to your cam, and full CNC porting—but upgrades to +1.5mm oversized valves. This larger valve setup tightens the chamber volume to 89cc, making it ideal for flat-top and dished-piston “box big bore kits.” It’s also a great option for hot-rod builds when the full 2mm valve head package is outside the budget. Please include cam specs when shipping.
Stage 4 Head Service is our race-inspired +2mm valve package featuring full CNC porting for maximum airflow and top-end performance. Chamber volume is set to 90-92cc, making this head ideal for high-compression big-inch and high-RPM builds. This is the same head we have used time and time again on our 170+ HP 124/128” combinations. It is our highest-flowing Milwaukee-Eight head option and the foundation for true race-level power. Please include cam specs when shipping.
Please Note:
This service is performed on customer-supplied castings. If your heads arrive damaged, we are not responsible; we will document and send photos immediately upon receipt. Please over-pack and protect your parts when shipping to ensure they arrive safely.
weld and deck is 1 working week turn around time
All porting services are 1-3 working weeks depending on work load constantly varying