Product Description
Interstate-McBee M-4089650 Upper Engine Gasket Set — .010" Oversize — 1989–1998 5.9L Cummins 12-Valve
Premium upper engine (top-end) gasket and seal set for the 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). This version includes a .010" oversize (thicker) head gasket to help maintain proper compression and quench after cylinder head/block resurfacing. Sold as 1 complete set.
- .010" oversize head gasket: Compensates for material removed during machining; verify piston protrusion before selection.
- Top-end refresh: Gaskets and seals for components serviced above the short block (head and related).
- Interstate-McBee quality: OE-style fit, finish, and reliable sealing for work and towing duty.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4089650 |
| Application | 5.9L Cummins 12-valve (6BT), 1989–1998 Dodge Ram 2500/3500 |
| Gasket Thickness | .010" oversize (thicker than standard) |
| Position | Upper engine / top-end |
| Sold As | Complete set (1) |
What’s Included
Upper engine gasket components appropriate for a 12-valve 5.9L rebuild including a .010" oversize head gasket and related top-end seals/gaskets. Exact contents may vary by production run—refer to product images or contact us for a contents list if you need item-by-item confirmation.
Vehicle Fitment
Always confirm by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins 12-valve (6BT)
- Model Years: 1989–1998
When to Choose .010" Oversize
- Head and/or block has been resurfaced and you need to maintain proper piston-to-head clearance.
- Measured piston protrusion suggests a thicker gasket is required per Cummins spec.
- Targeting stock-like compression after machine work.
Install Notes
- Measure piston protrusion with a dial indicator; select gasket thickness accordingly.
- Clean all sealing surfaces thoroughly; verify dowels and alignment.
- Follow the Cummins torque sequence and stage values; use new head fasteners if required by your hardware manufacturer.
- No sealant on MLS head gasket unless factory procedure specifies otherwise.
FAQ
Is this the right kit for my 12-valve 5.9L?
Yes, if you have a 1989–1998 5.9L Cummins (12-valve) and require a .010" oversize head gasket due to machining or measured protrusion. For stock, uncut engines, a standard-thickness kit is typically used.
Does this include lower engine gaskets?
No—this is an upper engine set. For oil pan, rear main, and other bottom-end components, use a lower or full engine set.
Can I reuse my head bolts?
Follow the hardware manufacturer’s guidance. Many builders replace head bolts or upgrade to studs during head service.
Why Buy From CPP Diesel
- ESN-verified fitment help from diesel specialists
- Fast shipping and easy returns
- Large in-stock selection for 6BT top-end and supporting parts
