Product Description
Seal big boost on your 12-valve. The INDUSTRIAL INJECTION PDM-4068C Fire Ring Head Gasket Kit is built for 1989–1998 5.9L Cummins (12V) engines that run elevated cylinder pressure. Spec’d for 4.550" fire rings with a robust .105" ring thickness and .034"–.036" groove depth, this kit is designed to pair with a properly cut fire-ringed head/block for maximum clamping and durability.
Fitment
- 1989–1998 Dodge Ram 2500/3500 5.9L Cummins 12-Valve
Specs
- Fire ring diameter: 4.550"
- Fire ring thickness: .105"
- Recommended groove depth: .034"–.036"
- Do not use factory head bolts — head studs required
What’s Included
- Industrial Injection fire-ring head gasket
- Matched 4.550" fire rings
Recommended Parts (CPP Internal Links)
- ARP 247-4203 Head Stud Kit (89–98 5.9L 12V)
- ARP 247-4205 625+ Head Studs (94–98 12V) — for high-HP builds
- MAHLE 4068C Standard Head Gasket (89–98 12V) — alternative when not using fire rings
- Industrial Injection PDM-54174 Fire Ring Kit (98.5–02 24V) — cross-gen reference
- Shop All Cummins Gaskets & Seals
- Shop Studs & Bolts (Cummins)
Helpful Notes
- Fire-ring builds require precision machine work. Have a qualified shop cut receiver grooves to the listed depth and concentricity.
- Always verify piston-to-head and valve-to-piston clearances when increasing clamp load and boost.
- Re-torque per stud manufacturer’s procedure with quality assembly lube.
FAQ
Will this work with a stock (non-machined) head?No. Fire-ring gaskets require a head and/or block cut for receiver grooves per the 4.550" spec. Use a standard gasket like the MAHLE 4068C if you are not fire-ringing.
Do I have to run head studs?Yes. Industrial Injection specifies not to use factory head bolts. We recommend ARP 247-4203 or ARP 247-4205 (625+) depending on the power level.
What boost level is this kit for?Fire-ring setups are typically chosen for high boost/high cylinder pressure builds (big single or compounds, heavy fueling). Consult your engine builder for suitability and machining strategy.
Do you offer a version for 24-valve engines?Yes — see our 1998.5–2002 24V Fire Ring kit listed above in Recommended Parts.
