The ShiftMass™ Arc Head is the heaviest head in our
launch lineup at 146g. It's a contoured profile wrapped
in hand-sewn Charcoal Alcantara over a precision-machined
6061-T6 aluminum core. Like every ShiftMass head, it
threads onto the base — no adapters needed.
Already own a ShiftMass Complete System? Swap to Arc by
hand. The base stays where it is; the head threads on
cleanly.
What's Included:
- ShiftMass™ Arc Head in Charcoal Alcantara
Features:
- 146g head weight — heaviest in the launch lineup
- Contoured profile with a weighted, hand-filling presence
- Charcoal Alcantara, hand-wrapped and sewn in-house
- Compatible with all current and future ShiftMass bases
- Hand-swap design — no tools required once the base is set
Built entirely in a small USA machine shop in Texas.
- Aluminum core machined from 6061-T6
- Alcantara wrapped and sewn in-house
- Designed, machined, wrapped, and assembled by hand
Notes:
- Head-only product. Requires a ShiftMass™ Weight-Adjustable
Base, sold as part of our Complete System kits.
- Works with every ShiftMass Complete System — Standard
Lockout and Large Lockout.
Not sure which system fits your car? Check the Complete
System fitment guide, or message us with your vehicle —
we'll verify before shipping.
Street Machine Works
