Product Description
Fix compression seal the right way with the MAHLE HS4961-3 head gasket set for the 1989–1998 Cummins 4BT 3.9L (B-Series). This +.020" (~0.50 mm) thicker upper head set helps restore proper quench after machining and adds margin for boosted or high-load builds, using OE-equivalent materials for reliable, long-term sealing.
Fitment
- 1989–1998 Cummins 4B / 4BT / 4BTA 3.9L (239 CID)
- Common in step-van, industrial, agricultural, marine, and swap applications—verify by engine family (4B/4BT) and CPL.
Cross-Reference / Alternatives (Mahle on CPP Diesel only)
- MAHLE HS4961 (Standard Thickness)
- MAHLE HS4961-2 (+.010)
- MAHLE CS4961 (Lower/Conversion Set)
- MAHLE OS32172 (4BT Oil Pan Gasket)
Notes
Always measure deck height and verify surface finish; select thickness to maintain quench and compression. Head bolts/studs are not included.
FAQ
Will this fit my 4BT?
Yes—if your engine is a Cummins 4B/4BT/4BTA 3.9L (239 CID). For swaps/industrial chassis, match by engine ID/CPL.
Why choose the +.020" thicker gasket?
It compensates for material removed during machining, helps maintain quench, and adds sealing margin for higher cylinder pressures.
Does this kit include head bolts or studs?
No. Reuse serviceable bolts or upgrade to quality studs for best clamp load retention.
Specifications for Mahle HS4961-3
| Attribute | Value |
|---|---|
| Brand | MAHLE |
| Part Number | HS4961-3 |
| Gasket Thickness | +.020" (~0.50 mm) over standard |
| Engine Compatibility | 1989–1998 Cummins 4B/4BT/4BTA 3.9L (239 CID) |
| Bore Reference | 4.02" (102.0 mm) |
| UPC | 027067094926 |
| GTIN | 027067094926 |
| Shipping | Free Shipping (ground); optional shipping insurance available at checkout |
| Prop 65 | This product can expose you to chemicals known to the State of California to cause cancer or reproductive harm. Learn more |
