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Eagle SIR I-Beam Connecting Rods
6.123" 5140 STEEL I-BEAM, JEEP 4.0, 242 cid
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Estimated Ship Date from Texas: Monday 10/19/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
SIR6123JB
Part Type:
Product Line:
Summit Racing Part Number:
ESP-SIR6123JB
UPC:
793348068046
Connecting Rod Length Center to Center (in.):
6.123 in.
Connecting Rod Beam Style:
I-beam
Connecting Rod Material:
Forged 5140 steel
Wrist Pin Style:
Floating
Pin End Bore Diameter:
0.931 in.
Rod Journal Diameter (in.):
2.095
Big End Bore Diameter (in.):
2.2080
Quantity:
Sold as a set of 6.
Cap Retention Style:
Cap screw
Big End Width (in.):
1.060
Clearanced for Stroker:
No
Connecting Rod Bolt Brand:
ARP
Connecting Rod Bolt Diameter:
3/8 in.
Connecting Rod Bolt Material:
8740 chromoly steel
Fastener Tensile Strength (psi):
190,000 psi
Connecting Rod Bolt Head Style:
12-point
Approximate Connecting Rod Weight (g):
605
Advertised Horsepower Rating:
550 hp
Advertised RPM Rating:
6,800 rpm
Weight Matched Set:
Yes
Remanufactured:
No
Magnafluxed:
Yes
Connecting Rod Color:
Shot-peened
Eagle SIR I-Beam Connecting Rods
Why spend time and money reconditioning your stock rods—when you can upgrade to a set of Eagle SIR I-Beam connecting rods for less? They're forged from 5140 steel for outstanding strength and reliability, and they come in both press-fit and bushed pin models. Their lightweight design places less stress on the rest of your rotating assembly to increase engine life and better handle high-rpm use. The rods are X-rayed, sonic-tested, magnafluxed, and shot-peened to stress-relieve the metal. They come with 12-point ARP Wave-Lok rod bolts and are weight-matched to within two grams. The big end sizing is controlled by in-house CNC equipment to ensure precise machining and accurate fitment. Order the individual rod or set recommended for your year/make and engine application.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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