CUMMINS 3978517 GENUINE OEM MARINE CYLINDER HEAD GASKET (.020) FOR 2003-2007 DODGE RAM DIESEL

The Cummins 3978517 Marine Cylinder Head Gasket (.020) is a genuine OEM replacement designed for 2003-2007 Dodge Ram Cummins 5.9L common rail engines. Engineered with marine-grade durability, this gasket provides superior sealing strength for high-boost, heavy-duty, towing, and performance applications.

Featuring an extra .020 thickness, this marine version is ideal for applications requiring tighter combustion sealing, higher compression control, or head/deck machining compensation. Built with OEM Cummins quality, this gasket ensures leak-free performance under the most demanding conditions.

Features & Benefits

• OEM Cummins Quality: Part #3978517.
• Marine-Grade Design: Enhanced sealing for high horsepower and boost applications.
• .020 Thickness: Designed for engines with machined heads/blocks or tighter tolerance needs.
• Fitment: Direct replacement for 2003-2007 Dodge Ram 5.9L Cummins.

Fitment

• 2003 Dodge Ram 2500/3500 5.9L Cummins
• 2004 Dodge Ram 2500/3500 5.9L Cummins
• 2005 Dodge Ram 2500/3500 5.9L Cummins
• 2006 Dodge Ram 2500/3500 5.9L Cummins
• 2007 Dodge Ram 2500/3500 5.9L Cummins

Cross Reference Part Numbers

• Cummins 3978517
• OEM marine cylinder head gasket (.020)

Frequently Asked Questions

What is different about a marine Cummins head gasket?

Marine gaskets are built with stronger sealing properties, making them ideal for high-boost diesel applications like performance, towing, and racing.

When should I use a .020 head gasket?

A .020 gasket is commonly used when cylinder heads or blocks have been machined, or when increased sealing thickness is required to control compression.

Is this gasket compatible with aftermarket head studs?

Yes. The Cummins 3978517 marine gasket works with ARP or OEM head studs/bolts for performance and reliability.

Related Categories

• 2003-2007 Cummins Gaskets & Seals
• 2003-2007 Cummins Cylinder Heads & Valvetrain

Tags

cummins 3978517, marine cylinder head gasket cummins, 5.9 cummins .020 head gasket, dodge ram 5.9 head gasket, cpp diesel gasket, cummins marine head gasket, cummins oem head gasket, 03-07 cummins marine head gasket, cummins performance head gasket

Fitment

• 2003 Dodge Ram 2500/3500 5.9L Cummins
• 2004 Dodge Ram 2500/3500 5.9L Cummins
• 2005 Dodge Ram 2500/3500 5.9L Cummins
• 2006 Dodge Ram 2500/3500 5.9L Cummins
• 2007 Dodge Ram 2500/3500 5.9L Cummins

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