Product Description
Cummins 3927063 — Genuine Cylinder Head Bolt for ISB 5.9L & 6.7L
MPN: 3927063 | Also Known As: cylinder head bolt, hex flange head cap screw, fracture-resistant screw
Genuine Cummins head bolt engineered to properly clamp the cylinder head to the block on ISB platforms. Direct-fit for 1998.5–2018 Ram 5.9L/6.7L applications when used per factory torque sequence and angle specifications. Sold individually; 26 required per engine for a complete set.
Features & Benefits
- OE metallurgy & thread form for accurate clamping and sealing.
- Flange-head design distributes load—no separate washer required.
- Direct replacement for stock refresh, head gasket service, or top-end overhaul.
- Corrosion-resistant finish to promote clean torque readings.
- Backed by Cummins quality for fit, function, and durability.
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1998.5–2002 | Ram 5.9L ISB (24V VP44) | Ram 2500/3500 |
| 2003–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
| 2007.5–2018 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Industrial/Off-Highway: ISB/QSB 4.5, 5.9, 6.7 variants—verify by ESN before ordering.
Compatibility Notes:
- For a complete engine set, order 26 bolts. Replace any bolt that shows corrosion, thread damage, or stretch.
- Always follow the Cummins torque sequence and angle in the service manual. Do not mix used and new fasteners.
- For high-boost performance builds, consider head stud kits; for OE service, use these OEM bolts.
Specifications
- Type: Cylinder head bolt (hex flange head)
- OE Part Number: 3927063
- Quantity Required: 26 per engine (sold individually)
Often Paired With
- Head gasket / Upper engine gasket set: year- and engine-specific (verify by VIN/ESN)
- Coolant & engine oil: refresh after head gasket service
- Intake/exhaust manifold gaskets: replace if removed during service
What’s In The Box
- (1) Genuine Cummins Cylinder Head Bolt (3927063)
Installation Tips
- Chase block threads and blow out debris; lightly oil threads & underside of flange if specified by the manual.
- Torque in sequence in progressive stages; complete any required angle steps per factory procedure.
- Do not reuse fasteners that have been stretched beyond spec; best practice is to install a full matched set.
FAQ
WILL THIS FIT MY 1998.5–2018 5.9L/6.7L CUMMINS RAM?
Yes—3927063 is listed for 1998.5–2018 5.9L & 6.7L Cummins Ram applications. Confirm by VIN/ESN for industrial engines.
HOW MANY HEAD BOLTS DOES MY ENGINE USE?
There are 26 bolts per engine. This part is sold individually; order 26 for a full set.
CAN I REUSE MY OLD HEAD BOLTS?
Best practice is to replace them during head gasket service. Never reuse any fastener that shows stretch, corrosion, or thread damage. Follow Cummins guidelines.
WHAT TORQUE SPEC SHOULD I USE?
Always use the factory torque sequence and angle values from the Cummins service manual for your exact ESN. Procedures vary by model year.
DO I NEED SEPARATE WASHERS?
No. This is a flange-head fastener designed to distribute load without a separate washer.
