CP Piston Ford XR6 I6 4.0L - Bore 3.634in - CR 9.0:1- Set of 6

CP Pistons is well-known for making strong internal engine components, and this set of forged pistons for the Ford XR6 I6 4.0L is a prime example. If you're rebuilding the engine in your XR6 and need reliable pistons that can handle more than stock, this set is built for the job. These are a 0.020 inch undersize set, meaning they are designed to be used when the cylinder bores have been machined to be slightly larger than factory specification to clean up any wear or damage.

Forged pistons, like these from CP Pistons, start as a solid block of aluminum that is heated and then hammered into shape under extreme pressure. This process creates a much denser and stronger grain structure compared to cast pistons, making them more resistant to the high pressures and temperatures found in performance or heavily used engines. This particular set is designed for a 9.0:1 compression ratio, which is a common target for builds that aim for improved power without sacrificing too much drivability or requiring extremely high octane fuel. The bore size is 3.634 inches, matching the specification for the 0.020 inch undersize requirement.

This is a complete set of six pistons, ready to be installed in your Ford XR6's inline-six engine. Remember that these pistons are not CARB approved and cannot be shipped to California. Always refer to the manufacturer's installation instructions for proper fitment and assembly procedures, especially when dealing with engine internals.