Ford Billet Rear Main Seal Housing cover / block support 4.6/5.4


This 1/2 thick billet aluminum CNC machined plate replaces the factory rear main seal housing. Its thick CNC construction helps support the rear of the block and provide a stable housing for the rear main seal to help prevent leaks and increase block 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 black oxide coated Grade 8 hardware and MMR 1 piece rear main seal. Fits all 93-14 2V,3V and 4V 4.6 or 5.4/5.8 (does not fit 5.0 Coyote) Aluminum and Cast Iron blocks. For use with all stock and aftermarket crankshafts. A MUST FOR ANY HIGH HP BLOCK BUILD!


Guaranteed leak proof design

No Messy silicone required like factory

Manufactured using Aerospace 6061 T6 Billet Alloy

New Mounting hardware

Viton O-ring gasket and MMR 1 piece rear main seal.

Fits all 4.6 , 5.4 , 5.8 and 6.8 blocks, including Ford Racing blocks and GT500 Blocks

Fits all stock and aftermarket crankshafts.

Plug and play install!

Proudly Manufactured in the USA by MMR

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  • Model: 400031
  • Manufactured by: MMR

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