Manley Chevrolet Small Block Piston Set - 4.040in Bore 1.250in CH, -2.50 CC

When you're building a high-performance Chevrolet small block, the pistons are a critical component. This set from Manley Performance includes eight forged pistons, each designed for a 4.040-inch bore with a 1.250-inch compression height and a -2.50cc valve relief. You also get tool steel wrist pins, which are a solid choice for durability under stress.

Manley uses domestic 2618 alloy forgings for these pistons, a material known for its strength and ability to handle demanding engine conditions. The pistons feature proven cam and barrel skirt profiles, which help generate power efficiently while also being designed to work well with your cylinder walls. They've also paid close attention to the ring lands and grooves, machining them to strict standards to ensure a good seal for more power. Manley's unique fixturing process allows them to machine the skirt and ring grooves in one operation, which helps ensure the ring grooves are perfectly square to the skirt.

This set is a popular choice among professional engine builders for good reason. Keep in mind that these pistons are not CARB approved and cannot be shipped to California. For a serious engine build, these pistons offer a well-built foundation.