INTERSTATE-MCBEE M-4089651 UPPER ENGINE GASKET SET .020 OVERSIZE 89-98 5.9L CUMMINS (AFTERMARKET REPLACEMENT)

Product Description

Interstate-McBee M-4089651 Upper Engine Gasket Set — .020" Oversize — 89–98 5.9L Cummins 12-Valve

Premium aftermarket upper (top end) gasket set for the 1989–1998 Dodge Ram 5.9L Cummins 12-valve (6BT). Includes a .020" oversize head gasket for resurfaced/milled heads or blocks. OE-style materials and fit. Designed as a complete top-end refresh kit.

Highlights

• .020" oversize head gasket: Correct compressed thickness for engines requiring oversize after machining.
• Complete top-end kit: Covers intake/exhaust, valve cover, rocker box, and common coolant/oil seals.
• Interstate-McBee quality: Trusted materials for sealing consistency and service life.

What’s Included*

• .020" OS multi-layer/composite head gasket
• Intake manifold gasket(s)
• Exhaust manifold gasket(s)
• Rocker box / upper valve cover gasket(s)
• Main valve cover gaskets
• Valve stem seals
• Injector sealing washers/o-rings (as applicable)
• Thermostat housing gasket
• Misc. coolant and oil seals for the top end

*Contents may vary slightly by production revision. Refer to the photo/listing contents for your exact kit.

Vehicle Fitment

Always verify by engine serial number (ESN) when possible.

• Dodge Ram 2500/3500 with 5.9L Cummins 12-valve (6BT)
  • Model Years: 1989–1998
• Other B-Series 5.9L 12V applications where a .020" OS head gasket is specified.

Install Notes

• Confirm required head gasket thickness after measuring piston protrusion and deck/head machining.
• Clean and dry mating surfaces; follow Cummins torque/angle specs and sequence.
• Replace head bolts if required (or use appropriate studs); lubricate threads/washers per manufacturer instructions.
• Recheck final torque after initial heat cycle if your fastener manufacturer specifies it.

Why Buy From CPP Diesel

• Knowledgeable diesel support (ESN verification available)
• Fast shipping and competitive pricing
• Huge selection of complementary 6BT components

FAQ

What does .020" oversize mean?

It refers to a thicker-than-stock head gasket used to compensate for material removed during head/block machining. Verify required thickness by measuring piston protrusion and deck height.

Is this for 12-valve only?

Yes. This kit is for 1989–1998 5.9L Cummins 12-valve engines. It does not fit 24-valve (1998.5–2002) engines.

Do I need new head bolts?

Head bolts are not included. Inspect and follow Cummins guidance; many installers choose new bolts or performance studs.