Manley Small Block Chevy 4.125in Bore - 1in CD - -20 cc Dish Platinum Series Pistons

This set includes eight Manley Platinum Series forged pistons, designed for Small Block Chevy engines with a 4.125-inch bore. Each piston features a -20cc dish, which helps achieve a specific compression ratio when paired with your cylinder heads. These pistons are built using Manley's signature Platinum Series construction, a popular choice among professional engine builders for their reliability and performance.

Manley uses domestic 2618 alloy forgings for these pistons, a material known for its strength and ability to handle demanding engine conditions. They come standard with tool steel wrist pins for added durability, and the pistons themselves feature cam and barrel skirt profiles. These profiles are carefully shaped to help generate power while also being considerate of your cylinder walls during operation. The ring lands and grooves are machined to exacting standards, which is crucial for achieving a good seal with your piston rings, ultimately contributing to better engine performance.

The manufacturing process includes unique fixturing that allows Manley to machine the skirt and ring grooves in a single setup. This ensures the ring grooves are perfectly square to the piston skirt, which is another detail that contributes to a solid ring seal and overall engine health. Keep in mind these pistons are not CARB approved and cannot be shipped to California.