Product Description
MAHLE 4021 is a composite cylinder head gasket engineered to OE specifications for the 1994–2002 GM 6.5L diesel. Built with a premium facing bonded to a perforated steel core, it delivers reliable sealing under diesel cylinder pressures.
- Material: Composite, OE-grade
- Bore: ~4.150" (105.4 mm)
- Compressed Thickness: ~0.040" (1.02–1.07 mm)
- Sold individually (head bolts/studs not included)
- GTIN/UPC: 757522714310
Fitment
- 1994–2002 Chevrolet & GMC 2500/3500 trucks with 6.5L diesel (RPO L65/L57)
- Also fits other GM platforms equipped with the 6.5L diesel in this year range — verify by VIN/engine before purchase.
Cross-Reference & Alternatives
- Fel-Pro: 9701PT (commonly referenced)
- GM OE: 12554979, 12556031 (commonly referenced)
- MAHLE Set (High Output): HS4021A – complete head set option (6.5L HO)
- MAHLE Thickness Variant: 4021T – thicker service gasket for decked heads
What’s Included
(1) Cylinder head gasket, left or right as required. Order quantity (2) for both banks on V8 applications.
Recommended Pairings
- New head bolts or studs, proper surface prep, and torque-to-yield procedures per GM service manual.
- Related CPP parts: MAHLE 4021T (thick), MAHLE HS4021A (HO head set), lower engine gasket set CS3678A.
FAQ
Will this fit my 6.5L?Yes, it’s specified for 1994–2002 GM 6.5L diesel applications. Always confirm by VIN/engine RPO before ordering.
Is this an MLS gasket?
No. MAHLE 4021 is a high-quality composite head gasket built to OE standards for the 6.5L diesel.
What are the bore and thickness?
Approx. 4.150" bore and ~0.040" compressed thickness, matching OE spec for this engine family.
Do I need new head bolts?
Yes, replacement is strongly recommended. Follow GM torque-to-yield procedures and surface finish specs for best results.
What if my heads have been decked?
Consider MAHLE 4021T (thicker service gasket) or verify piston-to-head clearance and compression targets before choosing thickness.
