INTERSTATE MCBEE
INTERSTATE-MCBEE M-3958644 MULTI-LAYER THIN HEAD GASKET 03–07 5.9L CUMMINS (AFTERMARKET REPLACEMENT)
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- SKU:
- MCBM-3958644
- MPN:
- M-3958644
- Shipping:
- Calculated at Checkout
Description
Interstate-McBee M-3958644 Multi-Layer Thin Head Gasket – 2003–2007 5.9L Cummins
Premium multi-layer steel (MLS) thin head gasket engineered to OEM-equivalent specs for the 2003–2007 5.9L Cummins 24-valve (ISB). The M-3958644 “thin / Grade A” profile maintains factory compression and delivers reliable sealing for stock and performance street builds.
- Direct OEM cross-reference: Cummins 3958644 (thin / Grade A).
- MLS construction: Multi-layer stainless with precision embossing for heat, pressure, and corrosion resistance.
- Factory compression retained: Thin profile helps preserve OEM quench and cold-start behavior.
- Aftermarket value: Interstate-McBee quality at a better price point than OEM boxed parts.
Specifications
| Manufacturer | Interstate-McBee |
|---|---|
| Part Number | M-3958644 |
| OEM Reference | Cummins 3958644 (Thin / Grade A) |
| Material | Multi-Layer Steel (MLS) |
| Profile | Thin / Grade A (typ. ≈1.18 mm nominal) |
| Engine | Cummins 5.9L ISB 24V (B-Series) |
| Years | 2003–2007 (pre-2007.5) |
| What’s Included | (1) MLS cylinder head gasket |
Vehicle Fitment
Always confirm by Engine Serial Number (ESN) for exact match.
- Dodge Ram 2500/3500 — 5.9L Cummins 24-Valve ISB, 2003–2007 model years.
- Not for: 1998.5–2002 24V or 2007.5+ 6.7L Cummins applications.
Install Notes
- Deck and head surfaces must be clean, flat, and within RA finish spec; follow Cummins procedures.
- Use new head bolts or quality studs and follow the factory torque-angle sequence.
- Verify injector protrusion and piston protrusion where applicable.
Alternates & Related
- Thick option: Cummins 3958645 (MLS thick) for lowered compression / larger corrections.
- Oversize/marine: 3978517 (application specific; verify by ESN).
Why Buy From CPP Diesel
- ESN-verified fitment support from real diesel techs.
- Fast shipping and hassle-free returns.
- Curated B-Series inventory to complete your top-end service.
FAQ
Is M-3958644 the “thin” head gasket?Yes. M-3958644 corresponds to the thin / Grade A MLS gasket used to maintain stock compression.
Will it fit all 2003–2007 5.9L 24V engines?
Yes, it’s listed for 2003–2007 5.9L ISB 24-valve Dodge Ram applications. Verify by ESN for edge-case builds.
What’s the difference between 3958644 and 3958645?
3958644 is the thin (Grade A) gasket; 3958645 is the thick MLS variant used when additional thickness is required. Choose based on machining, protrusion, and compression targets.
Do I need to machine the head/block?
Surfaces must be within flatness and RA specifications. If out of spec or damaged, machining is recommended before gasket install.
Can I reuse an MLS head gasket?
No. MLS head gaskets are single-use. Always replace after removal.
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