Engines and Components› Connecting Rods and Components

Manley Performance

ROD-5.4L 6.657 300M I BEAM

$610.20

SKU: M004 15321R6-1

In Stock
In Stock
Ships by Jun 9
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Manley 15321R6-1 is a 300M 6.657 I-Beam connecting rod for Ford 5.4L/5.8L V8 engines, designed for high-performance applications up to 1500+ HP. It features ARP 625+ cap screws and is forged from aircraft-quality vacuum degassed material.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandManley Performance
Part NumberM004 15321R6-1

Videos

Manley Connecting Rods

Manley Connecting Rods
99 Mustang GT with Nemak Part 4 – Assembling Manley Rods and Pistons with King Bearings

99 Mustang GT with Nemak Part 4 – Assembling Manley Rods and Pistons with King Bearings

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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