Product Description
MAHLE HS4961-3 is the +.020" thicker head gasket head set for the Cummins 4BT 3.9L. Built with OE-equivalent materials, it restores reliable sealing on high-mileage or boosted 4B/4BT builds. Head bolts/studs not included.
- Engine: Cummins 4B / 4BT 3.9L (239 CID)
- Gasket thickness: +.020" (~0.50 mm) over standard
- Bore size: 4.02" (102.0 mm)
- Set type: Upper cylinder head set for head-service reassembly
- Materials: OE-equivalent composites/seals
- MPN: HS4961-3 • GTIN/UPC: 027067094926
Fitment
- Applications using the 3.9L Cummins 4BT diesel, commonly found in 1989–1998-era platforms and popular swaps/conversions. Verify by engine family (4B/4BT) and CPL.
Cross Reference & Notes
- Supersedes/alternate: MAHLE HS4961 (standard thickness) for standard-height builds.
- UPC/GTIN: 027067094926
What’s Included
Complete upper head set for the 4BT: head gasket (+.020"), intake/exhaust and related seals/gaskets needed for head service (contents may vary by production run). Fasteners sold separately.
FAQ
Will this fit my 4BT?
Yes—if your engine is a Cummins 4B/4BT 3.9L. For industrial/chassis swaps, match by engine ID/CPL.
Why choose the +.020" thicker gasket?
It helps maintain proper quench after machining or when using pistons that sit higher, and can add margin for boosted applications.
Does the kit include head bolts or studs?
No. Pair with quality head studs for best clamping and seal retention.
What surface finish is recommended?
Follow Cummins specs for head/block flatness and RA; proper prep is critical for long-term sealing.
