Ford Racing 1979-93 Mustang Off-Road Idler Bracket - M-8604-A50

The Ford Racing M-8604-A50 Off-Road Idler Bracket is a competition-grade smog pump eliminator designed specifically for 1979–1993 Ford Mustang applications equipped with the 302 or 351 small block Ford engine. Purpose-built for off-road and race use where the air injection pump and catalytic converters are not used, this Ford Racing part lets you clean up your engine bay, reduce parasitic drag on your accessory drive, and keep your stock serpentine belt routing intact — all with a direct bolt-on installation.

Key Features & Benefits

• Smog Pump / Air Pump Eliminator: Replaces the factory air injection (smog) pump with a simple idler pulley bracket, eliminating the weight and rotational drag of a component that serves no performance purpose on a dedicated off-road or race build.
• Direct Bolt-On Replacement: Engineered to mount in the exact location as the stock air pump bracket, so installation uses existing hardware points — no custom fabrication required.
• Uses the Stock Serpentine Belt: Because the bracket retains proper belt routing geometry, you don't need to source a shorter or non-standard belt — a key convenience for builders working with a 5.0 or 5.8 fox-body engine combination.
• Reduces Weight and Parasitic Load: Removing the air pump and replacing it with a lightweight idler bracket saves both rotating mass and the mechanical energy it takes to spin the pump, freeing up power for the wheels.
• Ford Racing Competition Pedigree: Carries the Ford Racing (Ford Performance) part number M-8604-A50, the same part number used in genuine Ford motorsport applications for the fox-body 5.0 platform.
• Off-Road Use Only: Clearly designated for competition and off-road environments — this bracket is not intended for street use or emissions-controlled applications, making it the correct solution for dedicated track, drag, or off-road builds.

Specifications

• Brand: Ford Racing (Ford Performance)
• Part Number: M-8604-A50
• Application: Air pump / smog pump eliminator idler bracket
• Engine Compatibility: Small Block Ford 302 (5.0L) and 351 (5.8L)
• Belt Type: Compatible with stock serpentine belt
• Use Classification: Off-road / competition use only — not for use with catalytic converters
• Quantity: Sold as each (1 bracket assembly)

Fitment

This Ford Racing off-road idler bracket fits 1979–1993 Ford Mustang models equipped with the 302 (5.0L) or 351 (5.8L) small block Ford engine. It is designed for configurations where the air pump has been removed and catalytic converters are not in use. It is not appropriate for street-driven, emissions-tested, or catalytic converter-equipped vehicles. If your Mustang is subject to smog inspection or must remain emissions-legal, this bracket is not the correct part for your application. Always verify your specific engine and accessory drive configuration before ordering.

What's in the Box

• 1x Ford Racing M-8604-A50 Off-Road Idler Bracket assembly

Why Buy from ThreePiece.us

ThreePiece.us specializes in performance and racing parts, and our team understands the fox-body Mustang platform inside and out. When you order the Ford Racing M-8604-A50 here, you get free shipping on every order — no minimum threshold, no surprises at checkout. Need to spread out the cost of your build? We offer financing through Affirm, so you can get the Ford Racing parts you need now and pay over time. Have a fitment question about whether this bracket works with your specific 5.0 or 5.8 setup? Reach out to our team before you order — we're here to make sure you get the right part the first time.

Frequently Asked Questions

Q: Will this idler bracket work with my stock serpentine belt?

A: Yes. According to sourced product information, this Ford Racing smog pump eliminator bracket is designed to use the stock serpentine belt, so you do not need to purchase a shorter replacement belt when deleting the air pump on your 1979–1993 Mustang 302 or 351.

Q: Is this bracket street legal?

A: No. The Ford Racing M-8604-A50 is explicitly designated for off-road and competition use only. It is intended for applications where the air injection pump is not used and catalytic converters are not present. Do not install this bracket on a vehicle that will be driven on public roads or submitted to emissions testing.

Q: Does this bolt directly onto my fox-body Mustang without modifications?

A: Yes. This bracket is described as a direct bolt-on replacement for the stock air pump, designed to mount in the factory air pump location on 1979–1993 Mustang 302 and 351 engines. No custom fabrication should be required for a standard installation.

Q: Does this fit both the 5.0L and 5.8L engines?

A: Yes. The M-8604-A50 is confirmed to fit both 302 (5.0L) and 351 (5.8L) small block Ford applications in the 1979–1993 Mustang, provided catalytic converters are not in use and the vehicle is being used off-road or in competition.