Wiseco LS6125-927BL BoostLine Connecting Rods 6.125in 4340 Steel

The Wiseco BoostLine LS6125-927BL connecting rod set is engineered from the ground up for high-horsepower forced induction and nitrous applications. Featuring a patented 3-pocket beam design that merges the mass efficiency of an H-beam with the structural rigidity of an I-beam, these rods deliver 60% more bending strength and a 20% reduction in tensile stress compared to conventional H-beam connecting rods — making them an ideal upgrade for any serious power-adder build.

Each rod in this 8-piece set is forged from premium 4340 steel, then heat-treated and shot-peened for maximum fatigue resistance before final finish machining. ARP-2000 cap screws (rated at 220,000 psi) are included as standard hardware, delivering the clamping force needed for extreme cylinder pressures. The small end uses high-quality Ampco bushing material with a wrist pin clearance of 0.0009–0.0011 in., allowing engine builders to precisely set their own pin-fit specification.

Key Specifications:

• Rod Length (center-to-center): 6.125 in.
• Wrist Pin Diameter: 0.927 in.
• Big-End Journal Diameter: 2.100 in.
• Rod Bolt Size: 7/16 in. ARP-2000 (220,000 psi rating)
• Material: Forged 4340 Steel
• Rod Weight: 692g each
• Beam Design: Patented 3-Pocket (H/I hybrid)

Quality Assurance:

• Every rod individually inspected via coordinate measuring machine (CMM) for ultra-tight tolerances
• Each set includes a printed inspection report from Wiseco's quality team
• Rods are vacuum-wrapped in plastic for corrosion protection and separated by thick foam during shipping
• Designed, finished, and inspected in the USA

Upgrade to ARP 625+ bolts (260,000–280,000 psi) for the most extreme builds. The Wiseco BoostLine LS6125-927BL is proven in lab and track testing in 2,000+ HP eight-cylinder applications, making it one of the most capable connecting rod sets available for GM LS and Gen V LT platform engines.