At Borowski Race Engines, we use Callies Ultra rods for a lot of our boosted 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 connecting rods, which are subject to high output, high RPM applications. These design features enhance the Ultra against specific loads and stresses.
Ultra connecting rods are fastened by high alloy cap screws produced specifically for severe applications by ARP. Purpose built 260Ksi Ultra Bolts offer improved thread engagement for a smoother, more consistent net clamping load. To eliminate deformation and extrusion only Ampco 45 bronze silica alloy is used within the wrist pin housing bore. This material has a proven hardness more than 26% greater than commonly used Ampco 18 material. For high RPM or extreme horsepower applications, Ultra connecting rods are fitted with MP 3.5 bolts. These Ultra high alloy fasteners provide unparalleled clamping strength and toughness. Upgraded bolts are available for all Ultra I-Beam connecting rod configurations.
The Ultra and Ultra Enforcer I-Beam rods look pretty similar so we asked Callies' Brook Piper to explain the differences.
Quantity: Sold as a set of 8.
Connecting Rod Length Center to Center (in): 6.125 in.
Connecting Rod Beam Style: I-beam
Connecting Rod Material: Forged 4330 steel
Connecting Rod Finish: Shot-peened
Wrist Pin Style: Floating
Rod Journal Diameter (in): 2.100 in.
Big End Bore Diameter (in): 2.2250 in.
Big End Width (in): 0.940 in.
Pin End Bore Diameter: 0.927 in.
Pin End Width (in): 0.988 in.
Clearanced for Stroker: No
Cap Retention Style: Cap screw
Connecting Rod Bolt Brand: ARP
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Other: wire transfer
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