Product Description
The CUMMINS 3927063 OEM CYLINDER HEAD BOLT is the genuine fracture-resistant screw used to clamp the cylinder head to the block on ISB 5.9L and 6.7L applications from 1998.5–2018. Engineered by Cummins for precise clamping load, this OEM fastener helps maintain head gasket seal integrity under stock or mild performance use when torqued to factory specs and replaced as a complete set of 26 per engine.
Using genuine Cummins hardware instead of generic bolts helps prevent stretch, uneven clamping, and repeat head gasket failures on your Ram 2500/3500 ISB. Pair these bolts with a new Cummins head gasket and the correct 14 mm ring dowels for a OE-level repair that lasts.
Fitment – CUMMINS 3927063 OEM CYLINDER HEAD BOLT
- Engine families: Cummins ISB 5.9L 24V, ISB 6.7L (B-Series), select QSB 4.5/5.9/6.7 service applications – verify by ESN.
- Truck applications (typical): 1998.5–2018 Dodge/Ram 2500 & 3500 with 5.9L or 6.7L Cummins ISB.
- Quantity required: 26 head bolts per engine.
- Location: Cylinder head to block mounting hardware.
- Direct replacement for OEM Cummins P/N 3927063 when used with factory torque-to-yield procedure.
Cross-Reference & Related Genuine Cummins Parts (CPP Diesel)
For a complete top-end or long-block service on ISB 5.9L/6.7L, pair your CUMMINS 3927063 head bolts with these genuine Cummins parts available at CPP Diesel:
- Cummins 3977063 OEM Cylinder Head Gasket – Standard Thickness 5.9L 24V
- Cummins 3978517 OEM Cylinder Head Gasket – .020" Oversize 5.9L
- Cummins 3958645 OEM Cylinder Head Gasket – Thick MLS 5.9L ISB
- Cummins 5271251 OEM Cylinder Head Gasket – .020" Thickness ISB/QSB 6.7L
- Cummins 3900068 OEM Ring Dowel (14 mm) – 5.9L/6.7L Head & Main Alignment
- Cummins 3927948 OEM 12 mm Main Bearing Cap Bolt – 5.9L/6.7L
- Cummins 4376090 OEM Upper Engine Gasket Kit – ISB 6.7L
Why Choose Genuine CUMMINS 3927063 Head Bolts from CPP Diesel?
- OEM-grade metallurgy: Fracture-resistant design maintains clamp load through repeated heat cycles.
- Correct length and thread engagement: Designed specifically for ISB/B-Series deck height and casting.
- Prevents repeat failures: Ideal when replacing a head gasket or refreshing a high-mileage ISB 5.9/6.7.
- Perfect match to Cummins torque specs: Use factory torque-to-yield sequence for reliable sealing.
- Backed by CPP Diesel: Genuine parts, knowledgeable tech support, and fast shipping.
Installation Notes
- Always replace head bolts as a complete set of 26 when servicing the cylinder head.
- Clean bolt holes in the block and chase threads if necessary to remove debris or corrosion.
- Lightly oil threads and under-head bearing surface if specified by Cummins service literature.
- Follow the factory torque sequence and torque-angle procedure for your specific ISB/ESN.
- Verify head gasket thickness and compatibility (see Cummins 3977063, 3978517, 3958645, or 5271251 as applicable).
Specifications
| Specifications for cummins 3927063 | |
|---|---|
| Attribute | Value |
| Brand | Cummins Genuine Parts |
| Part Number | 3927063 |
| Product Type | Cylinder head bolt / fracture-resistant screw |
| Engine Compatibility | Cummins ISB 5.9L 24V, ISB 6.7L; select QSB 4.5/5.9/6.7 (verify by ESN) |
| Typical Truck Applications | 1998.5–2018 Dodge/Ram 2500 & 3500 with 5.9L or 6.7L Cummins ISB |
| Quantity Required Per Engine | 26 head bolts |
| Material | High-strength alloy steel (OEM Cummins specification) |
| UPC | Not specified by manufacturer |
| GTIN / EAN | Not specified by manufacturer |
| Cross Reference (Non-Cummins) | Victor Reinz 14-11227-01 head bolt set (contains 26x 3927063 bolt equivalents); additional OE references 1409717, 2171470 (verify application) |
| E-Codes / Emissions | N/A – hardware fastener does not alter engine emissions calibration |
| Shipping Info | Ships from CPP Diesel; small-parcel ground; shipping cost calculated at checkout; most in-stock orders ship within 1–2 business days |
| Country of Origin | As supplied by Cummins (varies by production lot) |
| California Prop 65 | Warning: This product can expose you to chemicals including toluene and/or benzene, which are known to the State of California to cause cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov. |
FAQ – CUMMINS 3927063 OEM CYLINDER HEAD BOLT
The ISB 5.9L and 6.7L platforms require 26 cylinder head bolts per engine. We strongly recommend replacing all 26 at the same time whenever the cylinder head is removed for a head gasket or top-end repair.
CAN I REUSE MY OLD CUMMINS HEAD BOLTS?
Cummins 3927063 head bolts are torque-to-yield fasteners. Once they have been stretched through the torque-angle procedure, reusing them can reduce clamp load and increase the risk of head gasket failure. For best results, replace all head bolts with new genuine Cummins 3927063 hardware any time the head is removed.
WHAT GASKETS SHOULD I PAIR WITH CUMMINS 3927063 HEAD BOLTS?
Match the head gasket to your engine’s piston protrusion and machining. CPP Diesel stocks several genuine Cummins gaskets that work with these bolts, including:
- 3977063 standard-thickness 5.9L 24V head gasket
- 3978517 .020" oversize 5.9L head gasket
- 3958645 thick MLS 5.9L gasket
- 5271251 .020" ISB/QSB 6.7L gasket
DO I NEED NEW RING DOWELS OR MAIN BEARING CAP BOLTS WHEN DOING A HEAD GASKET?
It is good practice to inspect the alignment dowels and bottom-end hardware any time the head is off. CPP Diesel carries genuine Cummins support hardware that pairs with your 3927063 head bolts, including:
- 3900068 14 mm ring dowels for head/main alignment
- 3927948 main bearing cap bolts for the lower end
- 4376090 upper engine gasket kit for 6.7L top-end reseals
ARE THESE CUMMINS 3927063 BOLTS SUITABLE FOR HIGH HORSEPOWER BUILDS?
These are genuine OEM replacement bolts designed for stock and mild performance levels within Cummins operating guidelines. For high-boost or competition builds, many customers step up to performance head studs. For daily-driven and towing applications within sane tune levels, new Cummins 3927063 bolts, a quality head gasket, and correct torque procedure deliver excellent reliability.
