Manley Ford XR-6 Turbo 4.0L 3.91in Stroke 3.647in Bore 9:1 CR -10cc Dish Piston Set w/Rings (ED)

If you're building a Ford XR-6 Turbo 4.0L engine, this Manley forged piston set is a solid choice for serious performance. These pistons are designed with a 3.91-inch stroke, 3.647-inch bore, and a -10cc dish to achieve a 9:1 compression ratio, making them suitable for boosted applications where controlled combustion is key. Manley has been a go-to for professional engine builders for a reason; they know how to make parts that hold up under pressure.

What sets these pistons apart is the material and machining. They're forged from domestic 2618 alloy, which offers excellent strength and durability compared to cast aluminum, especially important when you're pushing more boost. You also get premium chrome moly wrist pins, and Manley's cam and barrel skirt profiles are designed to reduce friction and wear on your cylinder walls while still generating power. They even use unique fixturing to ensure the ring grooves are perfectly square to the skirt, which helps with ring seal and ultimately, more power.

This set includes the pistons, rings, and wrist pins, so you have the core components ready for your engine build. Keep in mind that these are not CARB approved and cannot be shipped to California. For any high-performance engine build, especially one involving forced induction, using well-made components like these Manley pistons is crucial for reliability and achieving your power goals.