What material are these pistons made from?

These Manley pistons are forged from domestic 2618 alloy. This material is chosen for its superior strength and performance characteristics, making it well-suited for high-stress engine applications.

What is the purpose of the moly skirt coating?

The moly skirt coating on these pistons helps to reduce friction between the piston skirt and the cylinder wall. This can lead to improved engine efficiency and increased durability, especially under demanding operating conditions.

Are these pistons compatible with all Chevrolet Small Block engines?

These pistons are designed for Chevrolet Small Block engines with a specific 4.040 inch bore. While they are a performance-oriented component, you must ensure your engine build's specifications, including bore size and desired compression ratio, align with these pistons' characteristics.

Specifications

Brand: Manley Performance
Part #: 591540SMS-8
UPC: 807298099545

Manley Chevrolet Small Block Piston Set - 4.040in Bore 1.550in CH, -4.00 CC

Name: Manley Chevrolet Small Block Piston Set - 4.040in Bore 1.550in CH, -4.00 CC
Brand: Manley Performance
SKU: manley-performance-manley-chevrolet-small-block-piston-set-4-040in-bore-1-550in--t14-880262
Price: 922.62 USD
Availability: BackOrder

$922.62

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Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Manley Chevrolet Small Block Piston Set - 4.040in Bore 1.550in CH, -4.00 CC. Built with 2618 alloy forgings for superior strength and performance.

Key Features

Fits Chevrolet Small Block engines with a 4.040 inch bore.
Features a -4.00 CC dish for compression ratio tuning.
Constructed from domestic 2618 alloy forgings for superior strength and performance.
Includes tool steel wrist pins for added durability.
Moly skirt coatings are applied to help reduce friction and wear on cylinder walls.
Precision machined ring lands and grooves ensure enhanced ring seal for more power.

This piston set is designed for Chevrolet Small Block engines with a 4.040 inch bore. Please verify compatibility with your specific engine build.

⚠️ 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

If you're building or rebuilding a Chevrolet small block engine, this Manley Performance Piston Set is a solid choice for serious power. These pistons are designed for a 4.040-inch bore and feature a -4.00 CC dish, which is important for setting your compression ratio. Manley has been a go-to for professional engine builders for a long time, and this set is part of their signature "Platinum Series," meaning they're built to handle demanding performance applications.

What sets these pistons apart is the material and the machining. They're forged from domestic 2618 alloy, which is known for being strong and performing well under high stress. You also get tool steel wrist pins, and many part numbers, including this one, come with moly skirt coatings. This coating helps reduce friction and wear on your cylinder walls, which is crucial for engine longevity, especially when you're pushing the limits. Manley also pays close attention to the details, like the ring lands and grooves, ensuring a tight seal for maximum power. Their unique machining process ensures the ring grooves are perfectly square to the piston skirt, contributing to that enhanced ring seal.

This set is designed for performance builds where durability and power are key. Remember 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, especially when setting compression ratios and ring gaps.