Callies Ultra H-Beam LS Connecting Rods Valves Dart’s priority main oiling system

Dart’s priority main oiling system ensures high rpm reliability and includes provision for oil restrictors in the lifter valley

Use a  standard depth oil pan to maintain ground clearance for street use

Capable of 130 PSI while providing significant flow (full high speed)

We needed a 4L80E automatic transmission to handle our Whipple supercharged LS engines for mixed street and track use

Callies Ultra H-Beam LS Connecting Rods Valves Dart’s priority main oiling systemAt Borowski Race Engines, we use Callies Ultra rods for a lot of our LS engine builds. Why? Because they survive where others don't. Callies developed the Ultra connecting rod with the design goal of an uncompromised strength to weight ratio. Every Ultra connecting rod is produced from specially formulated Timken Steel 4330 and precision forged for uniform grain flow and consistency. Many geometric nuances are incorporated into the design of Ultra