Manley Chevrolet Small Block Piston Set - 4.040in Bore 1.550in CH, -2.50 CC

These Manley "Platinum Series" pistons are forged from domestic 2618 alloy, a material chosen for its exceptional strength and performance under high stress. They are designed for Chevrolet Small Block engines with a 4.040-inch bore and feature a 1.550-inch compression height, with a -2.50cc valve relief volume. This specific design helps ensure proper valve clearance and piston-to-valve geometry, which is critical for preventing interference at high RPMs or under heavy load.

Manley has incorporated proven cam and barrel skirt profiles into these pistons. This design helps the piston move smoothly within the cylinder bore, reducing friction and 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 key for achieving a better ring seal. A good ring seal means less blow-by and more efficient combustion, translating directly to more power. Each piston set includes tool steel wrist pins for added durability, and Manley's unique fixturing process allows for skirt turning and ring groove machining in a single operation. This ensures ultimate squareness between the ring groove and the piston skirt, contributing to overall engine reliability and performance.

When rebuilding or modifying a high-performance Chevrolet Small Block, choosing the right pistons is crucial. These Manley pistons are a solid option for serious engine builders and tuners looking for a well-built component that can handle demanding conditions. Please note 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.