Cummins 3283337 — Genuine Cylinder Head Gasket (+0.010") for 5.9L 12-Valve

MPN: 3283337  |  Also Known As: head gasket, oversize gasket, OS1  |  Thickness: +0.010" (OS1)

Genuine Cummins +0.010" oversize head gasket engineered to seal combustion and fluids after cylinder head or block machining on the legendary 5.9L 12-valve. Direct-fit for 1989–1998 Ram 2500/3500 5.9L 12V (6BT). Use when material has been removed during resurfacing to maintain proper compression and crush.

Features & Benefits

• OE multi-layer construction for reliable combustion and fluid sealing.
• +0.010" oversize thickness to compensate for milled head/block surfaces.
• 12-valve specific geometry for 1989–1998 6BT applications.
• Direct-fit with factory coolant/oil passage alignment.
• Backed by Cummins quality for fit, function, and durability.

Verified Fitment (Automotive)

Industrial/Off-Highway: 6B/6BT B-Series engines (verify by ESN and build list).

Specifications

• Type: Cylinder head gasket
• Application: 5.9L 12-valve (6BT) B-Series
• Thickness: +0.010" (OS1)
• OE Part Number: 3283337
• Quantity Required: 1 per engine

Often Paired With

• Head bolts or studs: Replace bolts if stretched; studs recommended for performance/boost.
• Upper engine gasket set: For a complete top-end refresh.
• Coolant and oil: Replace after head service.

What’s In The Box

• (1) Genuine Cummins Cylinder Head Gasket, +0.010" (3283337)

Installation Tips

• Confirm required thickness based on measured material removal/RA finish; +.010" is typical for light machining.
• Check flatness of head and block; follow Cummins torque sequence and specs.
• Use clean, dry surfaces; re-torque where procedure specifies. Pressure-test cooling system after heat cycle.

FAQ

WILL THIS FIT MY 1989–1998 5.9L 12-VALVE RAM?

Yes—this +.010" OS1 gasket fits 1989–1998 5.9L 12-valve (6BT) applications. Verify by VIN/ESN if unsure.

WHEN SHOULD I CHOOSE THE +.010" (OS1) THICKNESS?

Use +.010" when the head and/or block has been lightly machined so you maintain proper compression and gasket crush.

IS THIS COMPATIBLE WITH 24-VALVE (1998.5–2002) OR 2003+ COMMON-RAIL ENGINES?

No—those engines require different gaskets. This part targets 12-valve 6BT only.

CAN I REUSE A HEAD GASKET?

No—head gaskets are single-use components. Always install a new gasket during reassembly.

DO I NEED HEAD STUDS?

OE bolts work for stock power. For higher boost or heavy towing, studs improve clamping and long-term sealing.