Interstate-McBee M-3944593 Exhaust Manifold Bolt – 89–18 5.9L/6.7L Cummins

Heavy-duty hex-flange exhaust manifold bolt engineered to OEM dimensions for 1989–2018 Cummins B-Series / ISB 5.9L & 6.7L applications. Built for reliable clamp load, heat-cycle durability, and an OEM-equivalent fit at an aftermarket price. Sold individually; 12 required per manifold.

• Direct-fit replacement: OEM-equivalent form, fit, and function.
• Heat-resistant materials: Retains clamp load through thermal cycling to help prevent leaks.
• Aftermarket value: Interstate-McBee quality at a fraction of OEM bolt pricing.
• Sold individually: Order quantity to match your repair; most manifolds use 12.

Specifications

Vehicle Fitment

Always verify by engine serial number (ESN) when possible.

• Dodge Ram 2500/3500 – 5.9L Cummins
  • 1989–1993 12-Valve 6BT
  • 1994–1998 12-Valve 6BT
  • 1998.5–2002 24-Valve ISB
  • 2003–2007 24-Valve ISB (common-rail)
• Dodge/Ram 2500/3500 – 6.7L Cummins
  • 2007.5–2018 ISB 6.7L
• Other Cummins platforms: Widely used across B-Series / ISB and select ISC/8.3L applications; confirm by ESN.

Install Tips

• Clean threads and mating surfaces; chase threads if necessary to ensure accurate torque.
• Follow the Cummins service manual for torque and sequence; re-torque if procedure calls for it.
• Use anti-seize only if specified by service information; otherwise install dry/clean oiled per manual.
• On models requiring a spacer, use the correct 3945252 spacer at the designated bolt locations.

Warranty

Interstate-McBee new hardware carries manufacturer warranty coverage. Contact us for specific terms on fasteners.

Why Buy From CPP Diesel

• Tech-backed fitment support and ESN verification.
• Fast shipping and hassle-free returns.
• Curated Cummins hardware—match bolts, spacers, gaskets, and manifold kits in one order.

FAQ