Billet Rear Main Seal Housing Cover / Block Support Ford 4.6/5.4

This 1/2 inch billet aluminum CNC machined plate replaces the factory cast alloy rear main seal housing cover. Its thick CNC construction helps support the rear of the block and provides a stable housing for the rear main seal to 100% Eliminate leaks and increase block strength & stability.

The MMR cover is O ringed to eliminate messy silicone and downtime from scraping old silicone every time the engine is torn down. Includes hardware and MMR High performance 1 piece rear main seal. Anodized to protect from corrosion in harsh bellhousing environment.


1996-2010 Mustang GT

1998-2004 Mustang Cobra

2007-2014 Mustang GT500

1996-2010 F150 / F250 with 4.6 or 5.4

1993+ Lincoln 4.6 & 5.4

For use with all stock and aftermarket crankshafts & blocks. A MUST FOR ANY HIGH HP BLOCK BUILD!


Fits ALL 4.6 / 5.4 / 6.8 Cast iron and Aluminum Blocks

Anodized to prevent corrosion in harsh bellhousing environment

Guaranteed leak proof design No Messy silicone required like factory

Manufactured using Aerospace 6061 T6 Billet Alloy

New MMR Mounting hardware Viton O-ring gasket and MMR performance 1 piece rear main seal.

Plug and play install!

Designed for street use to full race use

As used in the 4000hp MMR World Record Holding MMR Promods!

Proudly Manufactured in the USA by MMR

  • Model: 400031
  • Manufactured by: MMR


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