What is the compression ratio impact of the -2.50cc dish volume?

The -2.50cc dish volume is a specific design choice that affects your engine's final compression ratio. It works in conjunction with your cylinder head combustion chamber volume and crankshaft stroke to achieve your desired compression. You'll need to calculate this based on your complete engine assembly.

What material are the included wrist pins made from?

These pistons come standard with premium chrome moly tool steel wrist pins. This material is chosen for its strength and ability to withstand the high stresses found in performance engines.

Are these pistons CARB approved?

No, these pistons are not CARB approved and cannot be shipped to California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 590130-8
UPC: 807298025063

Manley Chevrolet Small Block Piston Set - 4.030in Bore 1.250in CH, -2.50 CC

Name: Manley Chevrolet Small Block Piston Set - 4.030in Bore 1.250in CH, -2.50 CC
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-small-block-piston-set-4-030in-bore-1-250in--t14-880226
Price: 838.21 USD
Availability: BackOrder

$838.21

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Manley Chevrolet Small Block Piston Set - 4.030in Bore 1.250in CH, -2.50 CC. Built with 2618 alloy forgings for superior strength.

Key Features

Fits Chevrolet Small Block engines with a 4.030-inch bore.
Constructed from domestic 2618 alloy forgings for superior strength and performance.
Features a -2.50cc dish volume for specific compression ratio tuning.
Includes tool steel wrist pins for added durability.
Piston skirts have cam and barrel profiles designed to reduce cylinder wall wear.
Ring lands and grooves are machined to strict standards for enhanced ring seal.

These pistons are designed for Chevrolet Small Block engines with a 4.030-inch bore. Please consult your engine build specifications to confirm compatibility.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

Starting with domestic 2618 alloy forgings, these Manley pistons are built for serious performance in Chevrolet Small Block engines. The 4.030-inch bore size is a common specification for many popular Small Block Chevy builds, and the -2.50cc dish volume is designed to achieve specific compression ratios when paired with the right cylinder heads and crankshaft.

Manley's signature cam and barrel skirt profiles are a key feature here. They're shaped to reduce friction and wear on your cylinder walls while still allowing the piston to generate substantial power. This design choice means you get improved performance without sacrificing the longevity of your engine's components. The ring lands and grooves are machined to exacting standards, which is crucial for ensuring a tight seal with your piston rings. A good ring seal means better compression, more power, and less oil blow-by.

Included with these pistons are premium chrome moly tool steel wrist pins, known for their strength and durability. Manley also utilizes unique fixturing that allows them to machine the skirt and cut the ring grooves in one operation. This ensures the ring grooves are perfectly square to the piston skirt, which further contributes to that all-important ring seal. These are a solid option if you're rebuilding a performance Small Block Chevy and need pistons that can handle the demands of a high-output engine.