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USD 1186
Part #:

ProMaxx FOR85XN Replacement Cylinder Head

2003-2007 Ford 6.0L Powerstroke
Part #:
★★★★★ ★★★★★ 6 Reviews
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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Vehicle Applications

2003 Ford 6.0L Powerstroke
2004 Ford 6.0L Powerstroke
2005 Ford 6.0L Powerstroke
2006 Ford 6.0L Powerstroke
2007 Ford 6.0L Powerstroke

Product Options

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


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


★★★★★ ★★★★★
4.3/5 Stars out of 6 Reviews
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
Typical China product
Pro Max needs a guy in china over seeing production! My heads arrived and had all the valves at differant depths fron003 to 015 they spec @ .013 - .025 .020 IS PREFERED! not all over the place. these motors use valve depth to determine compression. So I spent 800 bucks on a vavle job and blue printed them myself. Not to mention they didn't have square dimensions but wedge instead of rectangle 1 of my exhaust manifold bolt holes needed to be tapped the correctly. They do have good valve seats though and are square where they need to be but having the whole job done in good old red china is what it is. They say 3-5 days but they have to order them from china so it will take 3 weeks. Thats what it takes for me to get my products made there if I wantedthem done there. XDPwas great in getting me the product but Pro Max has a quality issue I'd buy from another using the same supplier. If you meet the min you can have your name on them also from the same guy in china. And have them blueprinted.
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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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