Manley 03-06 Evo 8/9 (7 Bolt 4G63T) 85mm STD Bore 100mm Stroke 8.5:1 Dish Pistons w/ Ring

Starting with domestic 2618 alloy forgings, these Manley pistons are built for serious performance. They feature a dish design that results in a specific 8.5:1 compression ratio, making them a solid choice for builds where you need to control detonation under boost. The 85mm standard bore and 100mm stroke are key measurements for matching these pistons to your engine's needs.

Manley's attention to detail really shows in the cam and barrel skirt profiles. These aren't just round slugs; they're shaped to work with the cylinder walls, reducing friction and wear while still letting the engine make power. They also use unique fixturing to machine the ring grooves and turn the skirts in the same setup. This ensures the ring grooves stay perfectly square to the piston skirt, which is crucial for getting a good seal from your piston rings and maximizing the power your engine can produce.

Included with these pistons are premium chrome moly wrist pins, known for their strength. For those pushing the limits, Manley offers upgrades to even tougher alloys. The exacting standards they hold for the ring lands and grooves further contribute to a better seal, meaning more power and better durability for your engine build. These are a well-built component that professional engine builders trust for demanding applications.