Product Description
Interstate-McBee M-3902343 Cylinder Head Alignment Dowel – 1989–2018 5.9L / 6.7L Cummins
Premium cylinder head alignment dowel (also known as a ring dowel) built to OEM-equivalent specs for Cummins B / ISB / QSB 5.9L and 6.7L engines. This Interstate-McBee aftermarket replacement ensures precise head-to-block alignment during installation to protect gasket sealing and maintain factory timing geometry.
- OEM-style fit & function: Direct replacement for Cummins 3902343.
- Accurate alignment: Centers the cylinder head to help prevent head-gasket shear and sealing issues.
- Durable construction: Precision dimensions and quality materials suitable for stock or performance builds.
- Aftermarket value: Interstate-McBee quality at a fraction of OEM price.
Specifications
| Interstate-McBee P/N | M-3902343 |
|---|---|
| OEM Cross-Reference | Cummins 3902343 |
| Also Interchanges | Reliance K3902343; see performance kits (e.g., Fleece kit) for 2-pc sets |
| Common Quantity | 2 dowels per engine (verify per ESN) |
| Typical Dimensions | ~0.502" ID × 0.630" OD × 0.639" length (approx.) |
| Application Family | Cummins 4B/6B, ISB, QSB |
| Position | Block-to-head alignment dowel |
Vehicle Fitment
Always confirm by Engine Serial Number (ESN) for exact compatibility.
- Dodge/Ram 2500 & 3500 – 5.9L Cummins
- 1989–1993 12-Valve 6BT
- 1994–1998 12-Valve 6BT
- 1998.5–2002 24-Valve ISB (5.9L)
- 2003–2007 24-Valve ISB (5.9L)
- Ram 2500/3500/4500/5500 – 6.7L Cummins
- 2007.5–2018 24-Valve ISB (6.7L)
- Industrial/Commercial: B / ISB / QSB engines where 3902343 dowel is specified.
Install Notes
- Inspect and clean block and head dowel bores; replace any damaged locating pins.
- Use new head gasket; follow factory torque/angle sequences for head fasteners.
- Verify dowel quantity and location for your ESN; most builds use two alignment dowels.
What's Included
- (1) Cylinder head alignment dowel (order quantity as needed; many applications use 2)
Warranty
New Interstate-McBee engine parts are typically covered for 24 months from date of installation (valvetrain exceptions may be 12 months). Contact us for specific coverage details for this part.
Why Buy From CPP Diesel
- Verified fitment support by ESN and model year
- Fast shipping and easy returns
- Real diesel techs—call or message for install guidance
FAQ
Is M-3902343 the same as Cummins 3902343?Yes. Interstate-McBee M-3902343 is an OEM-style aftermarket replacement for Cummins P/N 3902343.
Will this fit both 5.9L and 6.7L engines?
Yes—applications include 1989–2007 5.9L and 2007.5–2018 6.7L B-series Cummins (verify by ESN).
How many dowels does my engine need?
Most B-series builds use two alignment dowels. Check your service manual or ESN to confirm.
Are there performance or heavy-duty versions?
Several performance kits cross-reference 3902343 (often sold in 2-pc sets). These interchange with OEM sizing.
Any special install tips?
Make sure dowel height is fully seated and bores are free of burrs. Follow OEM torque sequence for head fasteners.
Product Videos
Custom Field
YEAR 1989-2018
MAKE DODGE
ENGINE 5.9L,6.7L
