PRI 2025: Callies Solves The 6.7-liter Cummins Crankshaft Shortage

If you have tried to source hard parts for a diesel build recently, you know the headache. It’s gotten to the point where builders are buying entire donor engines just to harvest a single usable crank. At the 2025 PRI Show, Callies Performance Products put a stop to that madness. We caught up with Brook Piper at their booth to get the details on their new forged 6.7-liter Cummins crankshaft, and it is exactly the kind of hardware the industry has been waiting for.

Built For Abuse

Callies started from scratch using premium 4340 forged steel, giving it a massive strength advantage over a stock casting right out of the box. But the real engineering improvement is inside. Callies completely redesigned the oiling system, moving to a straight-shot, race-style feed. This addresses the notorious rod bearing issues that plague the newer common-rail engines. By ensuring the bearings get a direct, consistent supply of oil even under heavy load, they have effectively engineered the weak link out of the bottom end. They also increased the radii in high-stress areas, adding another layer of fatigue resistance for engines that see a lot of cycles.

Big Power, No Drama

Piper was confident about what this piece can handle, rating it for 2,000 horsepower. That is a staggering number for a “shelf” part, but it speaks to the quality of the forging and the machining. For the 1 percent of builders who need even more—like dedicated sled pullers—Callies is releasing a billet version later this year. But for the vast majority of us, this forged unit is more than enough to handle compound turbos, big injectors, and aggressive tuning without breaking a sweat.

The “Swiss Army Knife” Solution

Piper referred to this crank as a “Swiss Army knife,” and the description fits perfectly. Because it is designed to fit like an OEM component but perform like a race part, it works for everyone. Whether you are rebuilding a work truck that hauls heavy loads or putting together a nine-second drag truck, this single part covers the spread. Priced around $2,300, it is significantly cheaper than sourcing a questionable used engine, and you get a brand-new, race-proven component. It is a one-size-fits-all solution that finally gives Cummins owners a reliable foundation for their builds.