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The Manley Performance connecting rod identified by manufacturer part number 14040R-8 is engineered for a measured performance-engine assembly. Final compatibility depends on the exact engine, mating components, and verified dimensions, not a similar product title alone.
Key Features
- Forged 4340 Steel: Aircraft-grade alloy provides durability under extreme boost and nitrous applications.
- ARP 2000 Bolts: 3/8-inch high-strength bolts rated for 220000 psi tensile strength ensure secure big-end clamping.
- Precision Dimensions: 2.310-inch big-end bore 0.927-inch small-end bore and 2.1228-inch journal for direct fit with OEM crank and pistons.
- Lightweight Construction: Reduces rotating mass for quicker revs and better throttle response in 5.4L 3V builds.
- H-Beam Design: Handles up to 800 horsepower while keeping reciprocating weight low at 618 grams per rod.
- Yes direct replacement for stock rods in 2004-2008 F-150 5.4L Modular engines with 6.158-inch length.
Fitment
| Fitment Status | Engine and build verification required |
|---|---|
| Required Verification | Exact engine code, dimensions, mating components, material, intended power level, and current Manley application listing |
Specifications
| Brand | Manley Performance |
|---|---|
| Manufacturer Part Number | 14040R-8 |
| Product Type | Connecting Rod |
| Fitment Type | Fitment Verification Required |
| Condition | New |
| Engine Displacement | 5.4 L |
What's Included
One new Manley Performance connecting rod in the exact quantity and configuration stated in the specifications. Bearings, rings, pins, locks, fasteners, and installation hardware are included only when expressly listed for this part number.
About Manley Performance
Manley Performance engineers connecting rods, pistons, crankshafts, valves, valvetrain components, and related hardware for professional street, racing, and forced-induction engine builds.
Related Manley Performance Products
- Shop all Manley Performance products
- Manley Ford 4.6L Modular/5.0L DOHC Coyote V-8 22mm Pin LW Pro Series I Beam Connecting Rod Set
- Manley Ford 4.6L Modular/5.0L V-8 22mm Pin Forced Induction Pro Series I Beam Connecting Rod Set
- Manley Chrysler 5.7L/6.1L/6.4L Hemi ARP 2000 6.2in w/ 24mm Pin H Beam Connecting Rod - Set of 8
Frequently Asked Questions
How do I verify the application for Manley 14040R-8?
Match the exact Manley part number and engine code, then confirm every listed dimension, material, mating component, clearance, and intended power level before ordering.
What dimensions must match before ordering these connecting rods?
Confirm center-to-center length, big-end bore and width, wrist-pin diameter, small-end width, beam design, fastener specification, crankshaft journal, piston, and required clearances.
Can connecting rods be installed without balancing the rotating assembly?
A professional engine builder should measure every rod, verify fastener stretch or torque procedure, check bearing clearance and side clearance, and balance the complete rotating assembly.
Installation Instructions
Use the current Manley instructions for part number 14040R-8 and the engine builder's measured assembly specifications. Verify material, orientation, machining, clearances, fastener procedure, lubrication, balance, torque or stretch values, and break-in before operation.
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