CUMMINS 3920780 OEM HEXAGON FLANGE HEAD CAP SCREW (CYLINDER HEAD BOLT) – 5.9L 12-VALVE (1989–1998)

Product Description

The Cummins 3920780 OEM Hexagon Flange Head Cap Screw is the factory-correct cylinder head bolt used on 1989–1998 5.9L 12-Valve Cummins (6BT) engines. Engineered to withstand extreme combustion pressure, heat cycling, and long-term clamp load requirements, this genuine Cummins bolt ensures the cylinder head remains properly sealed to the block under all operating conditions. For stock, towing, work, and OEM-correct rebuilds, 3920780 cylinder head bolts deliver superior reliability compared to aftermarket substitutes.

Whether performing a top-end refresh, repairing a head-gasket failure, or completing a full engine rebuild, using genuine Cummins hardware guarantees correct torque specifications, metallurgy, and durability for the legendary 12-Valve 6BT.

Fitment

• 1989–1998 Dodge Ram 2500/3500 with 5.9L 12-Valve Cummins (6BT)
• Automotive B-Series 5.9L 12V engines
• Industrial/off-highway 6BT engines using OEM cylinder head bolts (verify by ESN)

Cross-Reference (Cummins-Only)

Related OEM Cummins valvetrain/block hardware:

• Cummins 3922488 OEM Rocker Lever Shaft – 5.9L 12V
• Cummins 3904408 OEM Valve Stem Guide – 60.50mm
• Cummins 3904409 OEM Valve Stem Guide – 51.75mm

FAQ

Are Cummins 3920780 bolts torque-to-yield?

No. These are standard reusable non-TTY head bolts used on 12-Valve engines. Always inspect for stretch or damage.

Should all head bolts be replaced during a head gasket job?

Yes. Cummins recommends replacing head bolts during major service to ensure proper clamp load and long-term reliability.

How many 3920780 bolts are required for one 12-Valve engine?

The 5.9L 12-Valve Cummins uses 26 cylinder head bolts in total.

Can these bolts be used with aftermarket head gaskets?

Yes — for OEM-equivalent gaskets. For high-boost builds, many users upgrade to studs, but 3920780 OEM bolts remain ideal for OEM power levels.

Specifications for cummins 3920780