Callies Ultra Boost (UB) family of crankshafts represent the pinnacle of severe duty shafts. Designed specifically for the most harrowing, ultra-high output applications where no exceptions are to be made for reliability, years of experience and talent culminate to shape the industry’s most capable crankshaft. Each Ultra Billet crank is machined from Callies renowned 4330 bar stock, sourced from TimkenSteel right here in Ohio. Taking lessons from the Top Fuel world, where our crankshaft routinely outperforms the competition, we’ve implemented similar design language into the Ultra Billet UB line. Two of the most prominent changes include increased material found on the pin arms and pin tops. These changes, along with others, allow for the most reliable crankshaft that is offered today— helping make sure you spend more time at the track than in the shop.
- Standard Average Weight 60lbs
- Fully 8 Counterweighted design
- Machined from TimkenSteel 4330 Alloy
- Uniquely machined counterweight profile for reduced weight and windage
- Gun drilled mains
- Full internal balance to your specific assembly weight No Drilling (optional)
- All rod journals lightened
- Heat Treatment = Ultra Case Deep Nitride
- Full support pin top for added strength
Please call to order, Billet crankshafts are made to order in any stroke up to 4.400".
