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4.6L / 5.4L 4V Freshen Up Cylinder Head Package

Basic Freshen Up Service for all Non Ti-VCT Cylinder Heads - Cleaning, Bronze Guides, Performance Valve Job, Surfacing, New Viton Stem Seals, Assembly
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MHS 4.6L / 5.4L 4V Freshen Up Package - Includes B, C, 03/04 Cobra, Mach 1, Navigator, Aviator and GT500 Heads

This is a great package for the budget minded ones. We realize some do not want to fork out the money for CNC ported heads as they are not necessary for every application. However, all 4V Heads are getting old and many of them have over 100K Miles which means worn out valve guides, leaky valve seals, carbon build up, ect. 

We can fix all those issues while improving performance. The answer is our Freshen Up Package. 
We start by disassembling the heads, thoroughly inspecting them for any possible damage, removing all oil galley plugs and freeze plugs, removing the old valve guides, deep cleaning them and bead blasting the ports and chambers to remove any additional carbon deposits. The heads are then moved over to our Seat and Guide area where our custom Bronze Guides are installed and honed to size. We then perform our Performance Valve Job (4 Angle Intake, 3 Angle / Radius Exhaust) and then blend the bowls to the valve seat if needed. (B Heads need some love in this area and there is no additional charge, it is part of the service). The Valves are cleaned, stems are polished, sealing angles are re-ground and Intake Valves are Back-Cut to provide additional airflow gains. The Heads are then surfaced on our CBN / PCD Surfacer and Assembled with our Viton Valve Stem Seals and your stock Valve Springs. We have multiple Valve Spring options as an upgrade. Heads will also be assembled with new USA Made Brass Freeze Plugs and New Oil Gallery Plugs. 

03/04 Cobra Guys and Gals - Please be aware that the 03/04 Cobra, Mach 1 and Aviator Heads all have less than adequate Exhaust Valve Seat press fit. We are not sure why, nearly every set we have seen in the last 3 years has had at least one loose exhaust seat. We will not take any chances in sending a set of heads out that we are not 100% confident in. We haven't had any Valve Seats fall out and we aren't planning on it! With that being said, we will have to replace the Exhaust Seats with a better alloy and fitment. The cost of this is an additional $320.00 and includes the price of the Valve Seats. 

Spark Plug Inserts: We can convert any 4 thread spark plug boss to a full 9 thread using the Timesert Aluminum Inserts. This can also repair any lightly damaged or pulled out threads. If your heads have already had a plug insert repair done, it is already too big for this option.  

Cylinder Head Cores: We have the 2004 Cobra DB 9 Thread Casting Cores on the shelf. These cores are available in addition to the cylinder head package. These cores have been thoroughly inspected and have perfect cam bores. This can save you the time and hassle of looking for good cores, as well as save you the cost of the in-bound freight. Please note if you do select our cores, you will still need to select the exhaust seat upgrade. 

Disassembly and Cleaning of all Parts
Bead Blasting of Ports and Chambers 
MHS Bronze Valve Guides - Honed to Size
Performance Valve Job (4 Angle Intake, 3 Angle / Radius Exhaust)
Reground Stock Valves with Polished Stems and Back Cut on Intake 
CBN Surfacing 
New Viton Valve Stem Seals 
New Brass Freeze Plugs and Oil Gallery Plugs 

SHIPPING- After your order is received, we will ship out a set of Cylinder Head Boxes to you with Pre-Paid Return Labels, all the proper packaging and packaging instructions to ensure your heads arrive safely. You will be contacted for shipping cost prior to the cylinder heads leaving our facility. 


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  • MHS-4V-Freshen
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Shipping Information

  • Item Requires Shipping
  • 100.0 lbs.
  • W24.0000” x H12.0000” x L12.0000”
  • Free Shipping!

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