What is the compression ratio these pistons will achieve?

The compression ratio depends on several factors including the cylinder head volume, head gasket thickness, and deck height. These pistons have a -2.50cc dish volume, which is designed to help achieve specific compression ratios when combined with other engine components.

Are these pistons coated?

Select Manley piston part numbers feature moly skirt coatings for reduced friction and wear. Please check the specific product details for this part number to confirm if a skirt coating is included.

What is the benefit of the cam and barrel skirt profiles?

These specific skirt profiles are designed to reduce friction and wear on the cylinder walls while still allowing the piston to generate substantial power. This helps ensure a longer engine life and consistent performance.

Specifications

Brand: Manley Performance
Part #: 591330-8
UPC: 807298026169

Manley Chevrolet Small Block Piston Set - 4.030in Bore 1.050in CH, -2.50 CC

Name: Manley Chevrolet Small Block Piston Set - 4.030in Bore 1.050in CH, -2.50 CC
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-small-block-piston-set-4-030in-bore-1-050in--t14-880255
Price: 962.04 USD
Availability: BackOrder

$962.04

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Manley Chevrolet Small Block Piston Set - 4.030in Bore 1.050in CH, -2.50 CC. Forged from 2618 alloy for superior strength and performance.

Key Features

Fits Chevrolet Small Block engines with a 4.030-inch bore.
Forged from domestic 2618 alloy for superior strength and performance.
Features a -2.50cc dish volume for specific compression ratio tuning.
Includes premium chrome moly wrist pins for durability.
Exacting standards for ring lands and grooves enhance ring seal and power.
Cam and barrel skirt profiles reduce friction and wear on cylinder walls.

These pistons are designed for Chevrolet Small Block engines with a 4.030-inch bore. Please consult manufacturer fitment data to confirm compatibility with your specific engine configuration.

⚠️ 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 gasket thickness.

Manley's signature cam and barrel skirt profiles are engineered to reduce friction and wear on cylinder walls while still generating substantial power. They've also paid close attention to the ring lands and grooves, holding them to exacting standards to ensure a better ring seal, which directly translates to more power and efficiency. The included chrome moly wrist pins are well-built for durability, and the unique fixturing Manley uses allows them to machine the skirt and ring grooves in one operation. This ensures the ring grooves remain perfectly square to the piston skirt, a critical detail for proper sealing under high stress.

These pistons are a popular choice among professional engine builders and tuners who demand reliability and performance. Keep in mind that these are not CARB approved and cannot be shipped to California. For optimal results, always refer to the manufacturer's installation instructions and consult with your engine builder regarding the correct combination of components to achieve your desired compression ratio and performance goals.