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Cummins 6B 5.9L 12 Valve Fully Loaded Cylinder Head

Cummins 6B 5.9L 12 Valve Fully Loaded Cylinder Head
Cummins 6B 5.9L 12 Valve Fully Loaded Cylinder Head

Available Options


  • Part Number: OHCHR618N
  • Est. Ship Time: 2-3 Business Days

Ships in 2-3 Business Days!!

1988-1998 Dodge Ram 5.9L Cummins 6B 12 Valve Diesel Fully Loaded Cylinder Head

By: Promaxx Performance

Due to some quality inconsistencies we HIGHLY recommend that at a bare minimum you have the surface of these heads checked for flatness and the valve job checked before installation. Other places will tell you this is a DROP IN ready-to-install head.. And technically you CAN, but we recommend you check them first or have us surface the head and at least do a standard valve job. Select the options above.  
We have sold hundreds of these cylinder heads and have had VERY few issues, but due to what we have seen, we recommend you check the surface and valve job.

Now available BARE! Select option above.


  • Cylinder head
  • Valves
  • Valve springs
  • Retainers, & keepers

Customers, please keep in mind that if you own a 88-91.0 Non-Intercooled Cummins, you will need to upgrade to injectors with 7mm nozzles in order to use this cylinder head.

These heads are cast in China, using tooling that allows for a thicker casting of the head in problem areas. No Core charge!

Standard exhaust springs come on the intake valves, 60lb upgraded springs come standard on the exhaust side, perfect for exhaust-brake users!

Basic standard cylinder heads are shipped factory direct. Any heads machined/modified by us are shipped in to us, modified, then re-crated for re-shipment.

The standard valve job work consists of machining the head for a better valve seal, the multi-angle valve job involves machining the head on 3 axis. 

Add up to 10 business days if you want o-rings cut in the cylinder head or need any other machine shop services.

O-ringing & Fire-Ring price includes decking of the cylinder head for optimal head gasket sealing & flatness.

NOTE: Any cylinder head that we do not do work on SHOULD BE CHECKED for flatness before installation. We also recommend the valve job & valve guide clearance be checked before installing the head for optimal performance and longevity. This is simply a precaution and should be done whether you get a head from Cummins or any other source.

Please Note: A portion of the upgrade price goes towards getting the cylinder head shipped to our shop, then being shipped to the customer after custom work is finished.

When custom work is done on these cylinder heads, some shavings may be present in the intake or exhaust ports. If you want us to clean & re-assemble your cylinder head before shipping it, please select the option below.

UPS shipping costs apply to the Lower 48 States only. Alaska, Hawaii, or overseas shipment will cost additional.

Want to read more about Fire Ringing vs O-Ringing your cylinder head? Click here!

NO LABOR Acceptance of this head constitutes acceptance of this warranty. ONE YEAR warranty - Limited to replacement of head and gasket NO LABOR Heat tab must be in place not altered or melted. Any claim must be returned to the manufacturer with a return number for inspection. Only one warranty per purchase. Replacement warranty runs the balance of the original purchase not to exceed one year from original purchase. Warranty begins at the day of purchase. No incidental,consequential or punitive damages. Warranty is not transferable.

Lame California Prop 65 Notice
Tags: dodge , ram , cummins , 6B , 5.9L , 12 , valve , diesel , loaded , cylinder , head