Callies U16300 Ultra H-Beam Connecting Rods 6.125" GM LS Series

The Callies U16300 Ultra connecting rods are made entirely in the USA from specially formulated Timken 4330V steel, designed for high-performance GM LS engine applications. These H-beam connecting rods feature a 6.125-inch center-to-center length with a 2.100-inch journal diameter, making them ideal for high horsepower and high RPM engine builds.

Key Features:

• Precision forged in Michigan and fully machined in Fostoria, Ohio facility
• Typical weight of 649 grams per rod
• H-beam design for strength and durability
• Fastened with high alloy cap screws made specifically for severe duty service by ARP Inc.
• AMS 642 bronze alloy bushing in wrist pin housing bore to eliminate deformation
• 0.927-inch wrist pin diameter with bushed small end
• 7/16-inch cap screws for secure fastening

Many geometric nuances have been incorporated into the design to enhance performance against specific loads and stresses applied to connecting rods subjected to high load, high RPM applications. The unique ARP bolts feature rolled threads offering improved thread engagement for smoother, more consistent net clamping load. Built with precision and pride, these Ultra connecting rods deliver the dependable performance and exceptional workmanship required for demanding racing and street performance applications.