Manley Chevrolet LS Piston Set - 4.005in Bore 1.115in CH, -18.00 CC

These Manley Performance pistons are forged from a domestic 2618 alloy, a material chosen for its exceptional strength and ability to handle high performance demands. The 4.005-inch bore size and -18.00cc dish volume are specific to certain LS engine builds, often used when aiming for a particular compression ratio, especially with aftermarket cylinder heads. The 1.115-inch compression height is also a critical measurement that dictates the piston's position in the cylinder at top dead center, directly impacting valve timing and piston-to-valve clearance.

Manley's design includes proven cam and barrel skirt profiles, which help manage piston rock and reduce wear on the cylinder walls while still allowing the piston to generate substantial power. The ring lands and grooves are machined to exacting standards, which is crucial for achieving a solid seal with your piston rings, leading to better cylinder pressure and more efficient power delivery. These pistons also come standard with premium chrome moly wrist pins, known for their durability, and Manley's unique fixturing process ensures the ring grooves are perfectly square to the skirt in a single operation, contributing to overall engine balance and longevity.

If you're building a high-performance LS engine, whether for street, strip, or track, these Manley pistons are a solid choice. They are designed to work with a variety of aftermarket cylinder heads and crankshafts, but it's always a good idea to double-check your desired compression ratio and valve-to-piston clearance with your specific combination. Keep in mind that these pistons are not CARB approved and cannot be shipped to California.