Description

AMC Jeep 258 Master Rebuild Kit – 4.2L Inline 6

Restore performance and reliability with this AMC Jeep 258 master rebuild kit, designed for 4.2L (258ci) inline 6 engines used in Jeep truck and SUV applications. This engine is known for its durability, strong low-end torque, and long service life.

The AMC 258 inline 6 was widely used in Jeep CJ, Wrangler, Cherokee, and Wagoneer models, making it a popular rebuild choice for both restoration and off-road applications.

This rebuild kit supports stock engine configurations and provides the components needed for a complete engine rebuild.

Browse additional options on our engine rebuild kits hub page to find the right kit for your build.

What’s Included in This AMC 258 Rebuild Kit

• Piston Set
• Piston Ring Set
• Rod Bearing Set
• Main Bearing Set
• Cam Bearing Set
• Full Gasket Set
• Camshaft
• Valve Lifters
• Timing Set
• Oil Pump
• Expansion Plug Kit

Available Sizes & Options

This kit is available in multiple size configurations to match your engine machining specifications.

Pistons & Ring Sizes (Oversize)

• Standard (STD)
• .020 Oversize
• .030 Oversize
• .040 Oversize
• .060 Oversize

Rod Bearing Sizes (Undersize)

• Standard (STD)
• .010 Undersize
• .020 Undersize
• .030 Undersize

Main Bearing Sizes (Undersize)

• Standard (STD)
• .010 Undersize
• .020 Undersize
• .030 Undersize

Engine Fitment & Notes

• Engine: AMC / Jeep 4.2L / 258 Inline 6
• Configuration: Inline 6-cylinder
• Years: 1971–1990
• Application: Truck / SUV
• Common Vehicles: CJ, Wrangler, Cherokee, Wagoneer

Why Choose This Kit?

This AMC 258 rebuild kit provides a complete solution for restoring a proven Jeep engine designed for off-road durability and long-term reliability.

• ✔ Complete master kit solution
• ✔ Designed for AMC / Jeep 4.2L engines
• ✔ Strong low-end torque performance
• ✔ Precision-fit components

Not sure which sizes you need? Review our engine rebuild kit guide
or learn more about proper measurements in our bearing clearance guide.

Need help selecting sizes or confirming fitment? Contact Benning Auto Parts @ 1-800-847-0733 for expert assistance.

Related Engine Rebuild Kits

Explore Jeep engine rebuild kits across multiple generations and configurations:

• Jeep 4.0L 242 Inline 6 Rebuild Kits (Next Generation Upgrade)
• Jeep 232 Inline 6 Rebuild Kits (Earlier Engine Platform)
• Jeep 3.8L V6 Rebuild Kits (Newer Wrangler Engines)
• Jeep 2.5L Inline 4 Rebuild Kits (Smaller Engine Option)