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USD 538
Part #: PXCHE855N

ProMaxx CHE855N Replacement Cylinder Head

GM 6.5L Diesel (Standard Head)
Part #: PXCHE855N
★★★★★ ★★★★★ 2 Reviews
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ProMaxx Performance Cylinder Heads are designed as replacement cylinder heads with thicker castings in crack prone areas. Sold 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! 
  • Includes Valve Seals, Springs
  • Improved Casting In "Problem Areas" 
Note: The standard heads will typically use a 1-piece intake and are normally found in truck applications. Please confirm what is in your vehicle before ordering.
Shipping Restrictions Apply shipping restriction icon This product can not be shipped to these states: CA

Vehicle Applications

1994 Chevy 6.5L Non-Duramax
1995 Chevy 6.5L Non-Duramax
1996 Chevy 6.5L Non-Duramax
1997 Chevy 6.5L Non-Duramax
1998 Chevy 6.5L Non-Duramax
1999 Chevy 6.5L Non-Duramax
2000 Chevy 6.5L Non-Duramax
1994 GMC 6.5L Non-Duramax
1995 GMC 6.5L Non-Duramax
1996 GMC 6.5L Non-Duramax
1997 GMC 6.5L Non-Duramax
1998 GMC 6.5L Non-Duramax
1999 GMC 6.5L Non-Duramax
2000 GMC 6.5L Non-Duramax


  • MFG. Number CHE855N
  • Manufacturer Name ProMaxx Performance
  • Shipping Weight 70.00 lb.
  • Shipping Length 12 in.
  • Shipping Width 30 in.
  • Shipping Height 10 in.
  • Fuel Type Diesel
  • Warranty Yes
  • Warranty Info 1 Year Limited
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L2.00R0.00


★★★★★ ★★★★★
4.5/5 Stars out of 2 Reviews
Great heads, they fit 6.2L diesels also!!
I was not sure if these heads would fit my 1984 6.2L GM diesel so I contacted PROMAXX directly. The gentleman I spoke with wasn't sure so he asked one of the technicians in the shop. They were 90% sure they would work. Fast forward to now. I got the heads installed and the truck is running GREAT! The only thing I had to change was the injection lines, the stock ones were to short to fit these heads. I had to order injector lines for the 1992-1993 mechanically injected 6.5L turbo diesel motor. My injectors fit as well as the 6.2L gasket set. The motor has a different sound to it, slightly higher compression I believe as well as being able to build more boost (which means more power) with the same fuel as the old heads were taking on. If you own a 6.2L diesel don't hesitate to buy these heads as a replacement to the poorly casted stock 6.2L heads.... BUY THEM!
good quality heads, replaced stock cracked heads with these, no problems so far with about 2k miles. however the packaging is cheap and one head came damaged but in a corner where it wouldnt affect anything if ground down slightly.

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Questions and Answers

What is the weight of the ProMaxx CHE855N?
View Staff Answer 
The ProMaxx CHE855N Replacement Cylinder Head weights 69.3 LBS.
What are the valve size specs? Will they work on a 1984 6.2L? I think the cast number on mine was a 178
View Staff Answer 

Standard valve specs for the 6.5L (The head will not work with the 6.2L)

What's the difference between the standard head and the angled one?
View Staff Answer 

The 6.5L engine was used in multiple applications. Some of the application utilized heads with bolts that went straight into the head and other utilized heads that the bolts went in on an angle.

If the application has a 3 piece intake, it will use angled head (normally found on the van or hummer). If the intake is one piece, it will use straight head (normally trucks).

If i get these will they work on my 1997 GMC K2500 6.5 Turbo diesel ?
View Staff Answer 

Yes, these will work for your application. However, you must verify if your truck requires the Angled or Standard Head.

If the application has a 3 piece intake, it will use angle heads (normally found on the van or hummer). If the intake is one piece, it will use straight heads (normally trucks).

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