Cummins 6B 5.9L 12 Valve Fully Loaded Cylinder Head [CUMOHCHR618N]

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

Includes cylinder head, valves, valve springs, retainers, & keepers. Injector bores are 7mm.

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.

Cast in a Cummins plant, using tooling that allows for a thicker casting of the head.

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

UPS has destroyed too many customized cylinder heads, we now need to ship all custom cylinder heads via a freight company. Please select shipping option below.
Standard cylinder heads ship via UPS direct from the warehouse.

For Porting/Polishing work, please allow up to 1 month for delivery. Please call ahead to verify lead times.
Our stage 2 port job flows 160CFM intake side and 185CFM on the exhaust side at .400" of lift., numbers may vary slightly per head as castings are not 100% consistent.

Back Cut Valve work includes back cut valves and custom 5 angle valve job.
Add up to 10 business days if you want o-rings cut in the cylinder head.

O-ringing 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. 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.
Basic standard cylinder heads are shipped factory direct.

If you want cut valves but no porting work done, please call us for an accurate quote.
If you want only o-ringing done with no other work, please call for an accurate quote.
If you want just 60LB Valve Springs Installed with no other head work, the $200 quote covers the price of the springs along with shipping of the cylinder head to our shop and then back to you.

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.

See our porting comparison pictures below.