MMR XHD - Extreme Heavy Duty Secondary Timing Chains 4.6 / 5.4

MMR EXTREME HEAVY DUTY Secondary Chains for 1993-2014 DOHC (ALL) Including GT500 for 4.6 / 5.4 DOHC Ford Modular)

Prevent the common secondary chain failure that leads to catastrophic engine failure. Larger cams and aftermarket valve springs place increased loads on the factory (copper colored link) chains that they were simply not designed to handle. Protect your investment with this Precision chain kit. Compatible with all factory and aftermarket tensioners, guides and sprockets. Improved materials, quality, strength and finish over factory chain. These chains are the strongest chain ever manufactured and tested to 10,000rpm and over 3000HP by Team MMR and are simply the finest chains you can purchase.

Direct replacement - plug and play!


93-2004 4.6 DOHC / Cobra / Mach One

2007-2014 Shelby GT500

1999-2004 Lincoln Navigator


Images below show the difference between a stock chain (right) and the MMR (left) in a side by side and exploded view.

  • Model: 487028
  • Manufactured by: MMR


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