Increase displacement. Increase torque. Increase presence.

Our Big Bore upgrade for Milwaukee-Eight engines is designed for riders who want real power gains — not just bolt-ons. We offer two installation paths depending on your current setup.

Option 1: Big Bore Installation (For Motorcycles Already Running S&S Stage 2)

This option is for bikes that already have a properly installed Stage 2 cam setup (e.g., S&S cam, upgraded cam plate, oil pump, lifters, pushrods).

Scope includes:

• Big Bore cylinders installation
• High-performance pistons installation
• Top-end disassembly & reassembly
• Gaskets, seals, required hardware
• Inspection of existing cam chest components
• ECU recalibration / dyno tuning required

This is the most cost-effective route if your cam chest has already been upgraded. You retain your existing performance cam and supporting components.

Option 2: Big Bore + Complete Cam Chest Upgrade (For Stock Stage 1 / No Stage 2)

This option is for motorcycles that do not yet have a Stage 2 cam upgrade.

Scope may include:

• Big Bore cylinders & pistons
• Performance camshaft
• Upgraded cam plate & high-flow oil pump
• Heavy-duty lifters
• Adjustable pushrods
• Cam bearings & related hardware
• Full cam chest service
• ECU recalibration / dyno tuning required

This is the recommended route for riders building from stock, ensuring reliability and proper oiling for the increased displacement.

Important Notes

• Final pricing differs between Option 1 and Option 2 due to parts and labor scope.
• Installation time and cost may vary depending on motorcycle condition (seized bolts, worn components, prior modifications, etc.).
• Proper tuning is mandatory after installation.
• We offer two oil options which are included in the cost of the service

If you're unsure which route applies to your bike, contact us with your current setup and riding goals — we’ll advise you properly.