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

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