Send us Your Heads- Speedmaster to Butler Process Head Upgrade Package, Ready to Assemble

This service is offered only for heads that have not been previously hand or cnc ported (unless previously ported by Butler)

We will take your current Speedmaster out of box heads or castings to a new level and make them a blueprinted Butler Spec, ready to assemble set of Heads.

Heads are Customized with the following:

• All heads are disassembled


• Cleaned


• Pressure tested


• Head deck milled for flatness


• Blueprinted and sent back to you or your builder, ready to assemble

• Standard Port Size or CNC Ported Options up to 340cfm


• 1.66 or 1.77 upgraded valve job and valves


• 2.19 valve used in 325 and 340cfm cnc ported heads 


• 5000 Series Ferrea Valves or upgrade to 6000 Series


• Chromoly Retainers or Titanium Upgrade


• 1.5 rocker or slotted to accept 1.65 rockers


• HR or FT Spring Option


• Stealth Logo Removal Option with painting if desired


• Mill to custom cc


• Chamber softening for boost on certain casting numbers

Heads will be inspected and we will contact you if any optional services are recommended before the services are started.

Choose one of the options for shipping to us.

Heads can be sent assembled or bare. We do not reuse any of the existing head parts except castings.

This service also includes Speedmaster Round Port heads and castings.