Callies Crankshaft Engineering

Rod Journal Oil Flow

The Callies oil hole system offers several advantages.
Rod journal oil flow improves due to a reduction in the angle of entry into the transfer hole from 135 degrees to 90 degrees.
For enhanced pickup, a low-pressure zone generated under the main bearing lead-in allows the oil film to gently lift prior to the oil hole.
By virtue of its narrower footprint, a round main bearing oil hole is less disruptive to the main bearing oil film than a common elliptical oil entry hole.

Callies Perma-Tough Heat Treat

Callies Perma-Tough heat treatment process does more than just produce a thin layer of nitrogen-rich surface material. It actually changes the micro-structure of the steel, creating a super tough structural component that penetrates deep into the crankshaft. The Perma-Tough feature allows each crank to be ground undersize without sacrificing hardness. Even after a -.030 regrind, these shafts can go directly back into service with complete confidence. The result: crankshafts that outperform and outlast all others.

A cutaway section view of a crankshaft that has received the Callies Perma-Tough heat treatment reveals the depth and location of hardened, heat effected areas. With the Perma-Tough process, all journal O.D.’s and fillets are treated.

Introduced late in 2005, the unique post radius heat treatment significantly increases the stiffness and fatigue strength of this critical region. Our Perma-Tough treatment combined with our unique deep hole post drilling will virtually eliminate post failures on Small Block Chevy crankshafts.

Callies Oil Flow Diagram

Callies Journal Heat Treat Pattern

Callies Post Radius Heat Treat