What kind of machine work is required for this rotating assembly?

This rotating assembly requires professional balancing to match the components to your specific build. The engine block will also need to be machined to accept the increased stroke and bore size. Always refer to manufacturer guidelines and consult with your engine builder for precise specifications.

Can I upgrade the connecting rod bolts?

Yes, you can upgrade the connecting rod bolts from the included ARP 8740 fasteners to ARP 2000 cap screws. This upgrade is recommended for builds targeting higher horsepower levels, increasing the assembly's capacity to 1,500 horsepower.

What is the compression ratio with these pistons?

The compression ratio depends on several factors, including your engine block's deck height, cylinder head combustion chamber volume, and head gasket thickness. These are -4cc flat-top pistons, which typically contribute to a moderate compression ratio when paired with common SBC cylinder heads.

Specifications

Brand: Manley Performance
Part #: 290130
UPC: 807298068671

Manley Rotating Assembly, SBC 383 3.750 STROKE/-4cc FLAT

Name: Manley Rotating Assembly, SBC 383 3.750 STROKE/-4cc FLAT
Brand: Manley Performance
SKU: manley-performance-manley-rotating-assembly-sbc-383-3-750-stroke-4cc-flat-t14-881227
Price: 3300.88 USD
Availability: BackOrder

$3300.88

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Manley Rotating Assembly, SBC 383 3.750 STROKE/-4cc FLAT. A well-built rotating assembly for serious engine builds.

Key Features

Fits Small Block Chevy (SBC) engines.
Features a lightweight 4340 forged steel crankshaft with a 3.750-inch stroke.
Includes 4340 forged steel H-beam connecting rods with 7/16-inch ARP 8740 cap screws.
Comes with 2618 forged aluminum Platinum Series pistons with a -4cc flat top.
Includes premium chrome moly wrist pins.
Rated for up to 750 horsepower with ARP 8740 bolts, or 1,500 horsepower with optional ARP 2000 cap screws.

This rotating assembly is designed for Small Block Chevy (SBC) engines. Please consult with a professional engine builder to confirm compatibility with your specific application and required machine work.

⚠️ 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 a high-performance Small Block Chevy engine and aiming for serious displacement and power, a robust rotating assembly is the heart of your build. This Manley Performance rotating assembly is designed to handle significant output, giving you a solid foundation for a 383 cubic inch stroker engine. It centers around a lightweight 4340 forged steel crankshaft with a 3.750-inch stroke, which is key to achieving that increased displacement from the standard SBC block.

Complementing the crankshaft are Manley's own 4340 forged steel H-beam connecting rods. These are well-built for strength and feature 7/16-inch ARP 8740 cap screws, with an option to upgrade to ARP 2000 fasteners for even greater clamping force and reliability at higher horsepower levels. The assembly also includes 2618 forged aluminum pistons from Manley's Platinum Series. These are flat-top pistons with a -4cc dish, designed to work with specific compression ratios depending on your cylinder head choice. Premium chrome moly wrist pins are included for durability.

This Manley rotating assembly is rated for up to 750 horsepower with the standard ARP 8740 bolts, and can handle an impressive 1,500 horsepower when equipped with the optional ARP 2000 cap screws. It's important to note that this assembly is not CARB approved and cannot be shipped to California. Ensure you have the correct machine work done on your block, including balancing, before assembly to achieve optimal performance and longevity.