PROFORM 66768 Adjustable Piston Ring Compressor for 4.205-4.310 in Bore

The PROFORM 66768 Adjustable Piston Ring Compressor is designed to help install piston rings smoothly and consistently on engines with a 4.205-4.310 inch bore. Its adjustable construction provides a secure fit across the specified bore range, helping keep rings properly aligned during piston installation and reducing the risk of damage caused by uneven compression or ring movement.
Built from lightweight aluminum, this piston ring compressor is easy to handle while providing the rigidity needed for engine assembly work. The red anodized finish adds corrosion resistance and supports long-term durability in professional shops, race garages, and home engine-building environments. The compact design also makes it convenient to use when working around pistons, cylinders, and other internal engine components.
The PROFORM 66768 is suitable for engine builders, mechanics, and automotive enthusiasts who need a dependable adjustable compressor for large-bore applications. Position the tool around the piston, adjust it to the appropriate bore size, and compress the rings evenly before guiding the piston into the cylinder. Its straightforward design helps streamline assembly and supports accurate piston installation without unnecessary complexity.

Features:

• Bore Range: Adjustable for 4.205-4.310 inch engine bores

• Construction: Lightweight aluminum body for easy handling

• Finish: Red anodized coating for added durability and corrosion resistance

• Application: Helps compress and align piston rings during engine assembly

• Brand: PROFORM

• Part Number: 66768