Product Description
CUMMINS 3283338 OEM CYLINDER HEAD GASKET (+.020 THICKNESS) – 3.9L 4BT (1989–1998)
The genuine CUMMINS 3283338 OEM cylinder head gasket is the factory-correct +.020 oversize head gasket used on 1989–1998 3.9L 4BT engines. This thicker gasket is engineered specifically for cylinder heads or engine blocks that have been resurfaced or machined, ensuring proper piston-to-head clearance, combustion sealing, and long-term durability. If your 4BT has undergone machine work, this oversize gasket is the only proper OEM solution to restore correct compression height and sealing integrity.
Built to Cummins specifications, the 3283338 gasket features multi-layer construction, precision sealing rings, and reinforced fire rings optimized for the high cylinder pressures of the 3.9L B-series platform. Whether you're rebuilding a 4BT for industrial, marine, agricultural, or automotive swap use, using an authentic Cummins oversize gasket is critical for reliability and leak-free operation.
Key Features
- Genuine Cummins OEM gasket – correct materials and thickness.
- +.020 oversize for resurfaced or machined cylinder heads/blocks.
- Designed for 3.9L 4BT engines across industrial, commercial, and automotive applications.
- Reinforced sealing rings for high-compression B-series operation.
- Restores proper combustion sealing and prevents coolant or oil intrusion.
Fitment Details
- Engine: Cummins 3.9L 4BT (B-Series)
- Years: 1989–1998
- Applications: Industrial, commercial, agricultural, marine, and swap vehicles using 4BT B-series
- Thickness: +.020 oversize (for machined heads/blocks)
Always verify oversize requirement by measuring head and block machining depth before ordering.
Cross-Reference & Companion Cummins Parts
For a complete and reliable 4BT top-end rebuild, pair the 3283338 gasket with other genuine Cummins components:
Common Cummins cross-reference numbers: 3283338, 3283338-020, 3283338NX (verify by ESN).
Installation Notes
- Verify cylinder head flatness and surface finish before installation.
- Confirm oversize requirement after machining.
- Use new head bolts or studs when required by Cummins procedure.
- Follow factory torque sequence and torque values carefully.
- Recheck coolant and oil levels after first heat cycle.
Specifications for cummins 3283338
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3283338 |
| Oversize Thickness | +.020 inch |
| Engine Compatibility | 3.9L 4BT (1989–1998) |
| Vehicle/Equipment Fitment | Industrial, commercial, marine, agricultural, and automotive swaps using 4BT |
| UPC | 190910285577 |
| GTIN | 190910285577 |
| Shipping Weight | Approx. 0.90 lbs |
| Shipping Method | Standard ground; expedited available |
| E-Codes / Emissions | Not emissions critical; sealing component |
| Prop 65 Warning | WARNING: May expose you to chemicals known to the State of California to cause cancer and reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by lot) |
Frequently Asked Questions
WHEN SHOULD I USE A +.020 OVERSIZE HEAD GASKET?
If your 4BT cylinder head or block has been machined, the +.020 thickness may be required to restore proper compression height and sealing. Always confirm machining depth before choosing oversize gaskets.
IS THIS A GENUINE CUMMINS HEAD GASKET?
Yes — this is a factory-original Cummins 3283338 gasket, not an aftermarket substitute.
CAN I USE THIS ON A 4BT AUTOMOTIVE SWAP?
Absolutely. The 3283338 gasket fits all 3.9L 4BT variants as long as machining requires a +.020 oversize gasket.
WHAT OTHER PARTS SHOULD I REPLACE DURING A HEAD GASKET JOB?
At minimum, inspect or replace head bolts/studs, injector seals, coolant hoses, and verify valve adjustment after reassembly.
HOW DO I VERIFY IF I NEED OVERSIZE GASKETS?
Measure machining depth against Cummins specifications or consult your machine shop. Oversize gaskets compensate for removed material.
