Akerly-Childs AC-RC4390 Tapered Piston Ring Compressor for 4.390-Inch Bore

The Akerly-Childs AC-RC4390 piston ring compressor is designed for installing piston rings into engine cylinders with a 4.390-inch bore. Its tapered profile helps guide the piston and rings smoothly into the cylinder, supporting efficient engine assembly and reducing the risk of ring damage during installation. The tool is well suited for engine builders, professional mechanics, and performance applications requiring accurate, controlled ring compression.
Constructed from lightweight aluminum, the AC-RC4390 combines durability with easy handling during repeated shop use. Its black anodized finish provides a clean, wear-resistant surface while helping protect the compressor from routine handling and workshop exposure. The dedicated bore size delivers a close fit for compatible engine assemblies, helping maintain consistent compression around the piston rings as they enter the cylinder.
The Akerly-Childs Ring Compressor 4.390 is supplied as an individual tool and is intended for applications using a 4.390-inch cylinder bore. Its practical design makes it a useful addition to engine assembly equipment for rebuilding, maintenance, and high-performance projects. The AC-RC4390 is not air restricted and does not require truck freight shipping, making it straightforward to incorporate into standard workshop operations.

Features:

• Brand: Akerly-Childs

• Part Number: AC-RC4390

• Tool Type: Tapered piston ring compressor

• Compatible Bore: 4.390 inches

• Material: Aluminum

• Finish: Black anodized

• Quantity: Each

• Air Restricted: No

• Truck Freight Only: No