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USD 1186

ProMaxx FOR85XN Replacement Cylinder Head

★★★★★ ★★★★★ 4.4 (7 Reviews)

Vehicle Fitment:
2003-2007 Ford 6.0L Powerstroke | See full application list below
FROM 1186
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The ProMaxx Performance Cylinder Heads are high quality replacements for your 2003-2007 Ford 6.0L Powerstroke. Built with thicker castings in crack prone areas, these heads undergo extensive testing and quality control to ensure that you receive the best product possible.

ProMaxx performs the following tests and procedures: All fuel rails are drilled and checked, All heads are push rod clearanced, glow plugs and injectors are test fit, all recession depths are checked, all heads are pressure tested, all holes are tapped including glow plug threads and each head gets an in-house valve job. 

Sold individually as a complete cylinder head with valves, valve seals, springs, retainers and locks, these new castings are sold without a core charge and come ready to install. Sold individually. 

  • New Casting
  • Sold Individually
  • No Core Charge!
  • Improved Casting In "Problem Areas" 
  • Available For 18MM & 20MM Dowels
Note: Model year ranges are suggested applications. Please confirm dowel size on your truck before ordering. 
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Product Options

FOR850N 03-05 (18mm) (8mm Rocker Carrier Bolts)
FOR851N 06-07 (20mm) (10mm Rocker Carrier Bolts)


  • ID 17894
  • Manufacturer Name ProMaxx Performance
  • Shipping Weight 75.00 lb.
  • Fuel Type Diesel
  • Warranty Info 1 Year Limited
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal LR


★★★★★ ★★★★★
4.4/5 Stars out of 7 Reviews
Verified Buyer
Awesome service!
Just Installed, and no issues.
I've given them a four star rating only because I don't have an extended number of miles on them yet. However, I was able to order these in a time crunch and have them delivered in two days. That allowed me to stay on schedule. That was actually pretty amazing. Next, they were packaged well, and they installed perfectly with the new ARP studs. I had not one glitch with anything. Nothing I saw indicated anything less than a perfect replacement for a time sensitive engine repair where I could not afford to wait n having my originals checked out and remanufactured. Fast forward, two days after I buttoned the engine back up, I hooked up to a 10,000 lb trailer and towed 2500 miles. As of now, I'm probably 3500 miles past the installation and initial fire up on these heads, and they are performing exactly like the originals did. What more could I expect? I'll let you know in another 200,000 miles if they hold up as well as the originals did.
Great product
about 15k on them. No issues
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Questions and Answers

Do the new cylinder heads come with new injector cups installed?
View Staff Answer 
Yes, the ProMaxx FOR85XN Replacement Cylinder Head for the Ford 6.0L’s come with new valves, seals, springs, retainers, locks and injector cups already installed.
What is the warranty on the heads?
View Staff Answer 
You have a 1 Year Warranty on the heads.
Do these have valve guide inserts and what material copper or steel?
View Staff Answer 

They come with a steel guide casted in the head (no liner).

Do these heads have hardened or thicker cast valve seat areas? Valve seat cracks are prominent ares of failures due to cracks. Is this one of the "problem areas" that have the heavier casting and are the seats hardened?
View Staff Answer 

The ProMaxx FOR85XN Replacement Cylinder Heads have a hardened valve seats.

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