Product Description
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)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1993 | 5.9L 12V (6BT) | Ram 2500/3500 |
| 1994–1998 | 5.9L 12V (6BT) | Ram 2500/3500 |
Industrial/Off-Highway: 6B/6BT B-Series engines (verify by ESN and build list).
Compatibility Notes:
- This is the +.010" (OS1) gasket for 12-valve engines. Standard and thicker options exist—select based on measured head/block machining.
- Not for 24-valve (1998.5–2002) or common-rail (2003+) engines—use the correct 24V/CR gaskets for those applications.
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.
