Ultra connecting rods are made entirely in the U.S.A. Every Ultra connecting rod is produced from specially formulated TimkenSteel 4330V steel. This material is then precision forged in Michigan and fully machined in our Fostoria, Ohio facility.
Many geometric nuances have been incorporated into the design of Ultra connecting rods. These design features enhance the Ultra against specific loads and stresses which are applied to connecting rods subjected to high load, high RPM applications. Ultra connecting rods are fastened by high alloy cap screws made specifically for severe duty service by ARP Inc. Produced with rolled threads, these unique bolts offer improved thread engagement for a smoother more consistent net clamping load. To eliminate deformation and extrusion only AMS 642 bronze alloy is used within the wrist pin housing bore.
Ultra I-Beams are available in our standard weight version for extreme duty racing applications of popular Big Block Chevy, Small Block Chevy, Chevy LS, Big Block Ford, Small Block Ford, RY45, Ford Modular, Nissan GTR, Buick 3.8, as well as lightweight versions for select SBC configurations. For superior clamping, a Custom Age bolt upgrade is available for all Callies I-Beam connecting rods.
Below is only a partial listing of part numbers. Please call for additional part number information and availability. Typical weights may vary slightly between sets. CA = Custom Age Bolts
| Big Block I-Beam | ||||
| Description | Rod Journal | Typical Wt. | Part # | |
| 6.385 | 2.200 | 809g | U15110 | |
| 6.535 | 2.200 | 817g | U15111 | |
| 6.660 | 2.200 | 822g | U15113 | |
| 6.700 | 2.200 | 826g | U15114 | |
| 6.750 | 2.200 | 825g | U15115 | |
| 6.800 | 2.200 | 829g | U15116 | |
| 6.385 | 2.200 | 814g | U15110-CA | |
| 6.535 | 2.200 | 822g | U15111-CA | |
| 6.660 | 2.200 | 827g | U15113-CA | |
| 6.700 | 2.200 | 831g | U15114-CA | |
| 6.750 | 2.200 | 830g | U15115-CA | |
| 6.800 | 2.200 | 834g | U15116-CA | |
| BBC Ultra Long Rod | ||||
| 7.100 | 2.200 | 848g | U15270 | |
| 7.200 | 2.200 | 853g | U15280 | |
| 7.100 | 2.200 | 853g | U15270-CA | |
| Big Block Small Journal | ||||
| ** Available by special request | ||||
| 6.385 | 2.100 | 798g | U15117 | |
| 6.535 | 2.100 | 805g | U15118 | |
| 6.385 | 2.100 | 803g | U15117-CA | |
| 6.535 | 2.100 | 810g | U15118-CA | |
| Small Block I-Beam | ||||
| Description | Rod Journal | Typical Wt. | Part # | |
| 5.700 | 2.100 | 642g | U14125 | |
| 5.850 - Honda | 1.888 | 580g | U14132 | |
| 5.850 | 2.000 | 629g | U14131 | |
| 5.850 | 2.100 | 648g | U14130 | |
| 6.000 - Honda | 1.888 | 586g | U14137-CA | |
| 6.000 | 2.000 | 636g | U14136 | |
| 6.000 | 2.100 | 656g | U14135 | |
| 6.125 | 1.888 | U14142-CA | ||
| 6.125 | 2.000 | 639g | U14141 | |
| 6.125 | 2.100 | 662g | U14140 | |
| 6.200 | 2.100 | 664g | U14145 | |
| 6.200 | 2.000 | U14146 | ||
| 6.250 | 2.000 | 641g | U14151 | |
| 6.250 | 2.100 | 667g | U14150 | |
| Small Block Light Weights | ||||
| Description | Rod Journal | Typical Wt. | Part # | |
| 6.000 | 2.000 | 600g | U14139 | |
| 6.000 | 2.100 | 613g | U14138 | |
| 6.125 | 2.000 | 602g | U14144 | |
| 6.125 | 2.100 | 616g | U14143 | |
| LS Series I-Beam | ||||
| Description | Rod Journal | Typical Wt. | Part # | |
| 6.125 | 2.100 | 662g | U17171 | |
| 6.125 | .927 pin | 2.000 | U17172 | |
| 6.350 | 2.100 | 674g | U17178 | |
| 6.350 | .866 pin | 2.100 | 655g | U17179 |
| 6.125 | 2.100 | 667g | U17171-CA | |
| 6.350 | 2.100 | 679g | U17178-CA | |
| Ford 460-429 | ||||
| with Ford Correct Tower Offset these rods are perfectly matched to Ford bore spacing | ||||
| Description | Typical Wt. | Part # | ||
| 6.700 | 2.200 | U15814 | ||
| 6.800 | 2.200 | U15816 | ||
| Ford 351 Small Block | ||||
| with Ford Correct Tower Offset these rods are perfectly matched to Ford bore spacing | ||||
| Description | Rod Journal | Typical Wt. | Part # | |
| 6.200 | 2.100 | 630g | U14845 | |
| 6.200 | 2.000 | U14846 | ||
| 6.250 | 2.100 | 630g | U14850 | |
| 6.250 | 2.000 | U14851 | ||
| RY45 | ||||
| 6.125 | 2.000 | 588g | U14844-CA | |
| Ford Modular | ||||
| These connecting rods are made to accommodate Ford Modular rod journal diameters and widths. Wrist pin bores are machined for .866 diameters. | ||||
| Description | Typical Wt. | Part # | ||
| 5.933 | 2.239 | 642g | U14825 | |
| Nissan VR38 / GTR | ||||
| Precisely manufactured for the VR38 engine. | ||||
| Description | Typical Wt. | Part # | ||
| 6.500 | 2.205 | U15300 | ||
| 6.500 | 2.200 | U15305 | ||
| Single GT-R rod | ||||
| These connecting rods are made to accommodate Nissan rod journal diameters and widths. Wrist pin bores are machined for .905 inch wrist pins. Ultra VR38 connecting rods are fastened with purpose built ARP 7/16 cap screws made of 260Ksi tensile strength specialty steel. | ||||
Ultra connecting rods are made entirely in the U.S.A. Every Ultra connecting rod is produced from specially formulated TimkenSteel 4330V steel. This material is then precision forged in Michigan and fully machined in our Fostoria, Ohio facility.
Many geometric nuances have been incorporated into the design of Ultra connecting rods. These design features enhance the Ultra against specific loads and stresses which are applied to connecting rods subjected to high load, high RPM applications. Ultra connecting rods are fastened by high alloy cap screws made specifically for severe duty service by ARP Inc. Produced with rolled threads, these unique bolts offer improved thread engagement for a smoother more consistent net clamping load. To eliminate deformation and extrusion only AMS 642 bronze alloy is used within the wrist pin housing bore.
Ultra I-Beams are available in our standard weight version for extreme duty racing applications of popular Big Block Chevy, Small Block Chevy, Chevy LS, Big Block Ford, Small Block Ford, RY45, Ford Modular, Nissan GTR, Buick 3.8, as well as lightweight versions for select SBC configurations. For superior clamping, a Custom Age bolt upgrade is available for all Callies I-Beam connecting rods.
Below is only a partial listing of part numbers. Please call for additional part number information and availability. Typical weights may vary slightly between sets. CA = Custom Age Bolts
| Big Block I-Beam | ||||
| Description | Rod Journal | Typical Wt. | Part # | |
| 6.385 | 2.200 | 809g | U15110 | |
| 6.535 | 2.200 | 817g | U15111 | |
| 6.660 | 2.200 | 822g | U15113 | |
| 6.700 | 2.200 | 826g | U15114 | |
| 6.750 | 2.200 | 825g | U15115 | |
| 6.800 | 2.200 | 829g | U15116 | |
| 6.385 | 2.200 | 814g | U15110-CA | |
| 6.535 | 2.200 | 822g | U15111-CA | |
| 6.660 | 2.200 | 827g | U15113-CA | |
| 6.700 | 2.200 | 831g | U15114-CA | |
| 6.750 | 2.200 | 830g | U15115-CA | |
| 6.800 | 2.200 | 834g | U15116-CA | |
| BBC Ultra Long Rod | ||||
| 7.100 | 2.200 | 848g | U15270 | |
| 7.200 | 2.200 | 853g | U15280 | |
| 7.100 | 2.200 | 853g | U15270-CA | |
| Big Block Small Journal | ||||
| ** Available by special request | ||||
| 6.385 | 2.100 | 798g | U15117 | |
| 6.535 | 2.100 | 805g | U15118 | |
| 6.385 | 2.100 | 803g | U15117-CA | |
| 6.535 | 2.100 | 810g | U15118-CA | |
| Small Block I-Beam | ||||
| Description | Rod Journal | Typical Wt. | Part # | |
| 5.700 | 2.100 | 642g | U14125 | |
| 5.850 - Honda | 1.888 | 580g | U14132 | |
| 5.850 | 2.000 | 629g | U14131 | |
| 5.850 | 2.100 | 648g | U14130 | |
| 6.000 - Honda | 1.888 | 586g | U14137-CA | |
| 6.000 | 2.000 | 636g | U14136 | |
| 6.000 | 2.100 | 656g | U14135 | |
| 6.125 | 1.888 | U14142-CA | ||
| 6.125 | 2.000 | 639g | U14141 | |
| 6.125 | 2.100 | 662g | U14140 | |
| 6.200 | 2.100 | 664g | U14145 | |
| 6.200 | 2.000 | U14146 | ||
| 6.250 | 2.000 | 641g | U14151 | |
| 6.250 | 2.100 | 667g | U14150 | |
| Small Block Light Weights | ||||
| Description | Rod Journal | Typical Wt. | Part # | |
| 6.000 | 2.000 | 600g | U14139 | |
| 6.000 | 2.100 | 613g | U14138 | |
| 6.125 | 2.000 | 602g | U14144 | |
| 6.125 | 2.100 | 616g | U14143 | |
| LS Series I-Beam | ||||
| Description | Rod Journal | Typical Wt. | Part # | |
| 6.125 | 2.100 | 662g | U17171 | |
| 6.125 | .927 pin | 2.000 | U17172 | |
| 6.350 | 2.100 | 674g | U17178 | |
| 6.350 | .866 pin | 2.100 | 655g | U17179 |
| 6.125 | 2.100 | 667g | U17171-CA | |
| 6.350 | 2.100 | 679g | U17178-CA | |
| Ford 460-429 | ||||
| with Ford Correct Tower Offset these rods are perfectly matched to Ford bore spacing | ||||
| Description | Typical Wt. | Part # | ||
| 6.700 | 2.200 | U15814 | ||
| 6.800 | 2.200 | U15816 | ||
| Ford 351 Small Block | ||||
| with Ford Correct Tower Offset these rods are perfectly matched to Ford bore spacing | ||||
| Description | Rod Journal | Typical Wt. | Part # | |
| 6.200 | 2.100 | 630g | U14845 | |
| 6.200 | 2.000 | U14846 | ||
| 6.250 | 2.100 | 630g | U14850 | |
| 6.250 | 2.000 | U14851 | ||
| RY45 | ||||
| 6.125 | 2.000 | 588g | U14844-CA | |
| Ford Modular | ||||
| These connecting rods are made to accommodate Ford Modular rod journal diameters and widths. Wrist pin bores are machined for .866 diameters. | ||||
| Description | Typical Wt. | Part # | ||
| 5.933 | 2.239 | 642g | U14825 | |
| Nissan VR38 / GTR | ||||
| Precisely manufactured for the VR38 engine. | ||||
| Description | Typical Wt. | Part # | ||
| 6.500 | 2.205 | U15300 | ||
| 6.500 | 2.200 | U15305 | ||
| Single GT-R rod | ||||
| These connecting rods are made to accommodate Nissan rod journal diameters and widths. Wrist pin bores are machined for .905 inch wrist pins. Ultra VR38 connecting rods are fastened with purpose built ARP 7/16 cap screws made of 260Ksi tensile strength specialty steel. | ||||