6.657 in. Length | 2.239 in. Big-End Bore | 22 mm Pin | Set of 8 | Ford 5.4L/5.8L GT500

Build your Ford 5.4L Modular / 5.8L GT500 V8 rotating assembly around Manley 14321R6-8, a 8-piece connecting rod set in the Pro Series Standard Weight I-Beam range. This version combines 6.657 in. center-to-center length, a 2.239 in. big-end housing bore and a 22 mm (0.866 in.) wrist-pin configuration with 7/16 in. ARP Custom Age 625+ cap screws. The exact dimensions, material and supplied fasteners identify the rod combination you are buying.

Key Features & Specs:

• Center-to-Center Length: 6.657 in.
• Wrist Pin Diameter: 22 mm (0.866 in.)
• Pin End Bore: 0.8671 in.
• Big End Housing Bore: 2.239 in.
• Crank Journal Diameter: Stock journal configuration
• Length Configuration: Stock
• Pin End Width: 0.940 in.
• Rod Material: Forged 4340 steel
• Rod Bolts: 7/16 in. ARP Custom Age 625+ cap screws
• Quantity: Set of 8
• Series: Pro Series Standard Weight I-Beam
• Beam Design: I-Beam
• Subseries: Standard Weight
• Approximate Rod Weight: 725 g per rod
• Engine Type: Internal combustion
• Engine Application: Ford 5.4L Modular / 5.8L GT500 V8
• Brand: Manley Performance
• Manufacturer Part Number: 14321R6-8
• Product Type: Engine connecting rod set

Performance Construction:

The Standard Weight Pro Series I-Beam combines a fully machined forged 4340 profile with application-specific rod geometry and ARP fasteners. Its defined weight class makes it straightforward to distinguish this set from Manley’s Lightweight and 300M alternatives. Shot peening after machining and individual magnetic-particle inspection are part of the Pro Series construction process.

The 6.657 in. center-to-center length identifies this Ford Modular rod family. Its 22 mm wrist-pin configuration and specified housing bore provide the dimensional basis for a 5.4L/5.8L performance rotating assembly. The named series and supplied bolt grade distinguish this version within Manley’s range.

The 0.8671 in. pin-end bore and 2.239 in. big-end housing bore describe the two rod ends, while the 6.657 in. center-to-center measurement defines rod length. Average rod weight is approximately 725 g per rod, giving this exact MPN a useful weight reference alongside its dimensions. The pin end measures 0.940 in. wide.

The supplied 7/16 in. ARP Custom Age 625+ cap screws are part of this rod’s specification. This ARP Custom Age 625+ version brings the stated fastener grade together with the 4340 steel I-Beam profile, pairing the documented fastener package with the forged rod construction. Manley catalogs this version with a heavier beam for forced-induction applications.

Fitment:

• Ford 5.4L Modular / 5.8L GT500 V8

What’s Included:

• 8 Manley Pro Series Standard Weight I-Beam connecting rods, manufacturer part number 14321R6-8
• 7/16 in. ARP Custom Age 625+ cap screws supplied with the rods