What is the horsepower rating for this rotating assembly?

With the standard 7/16" ARP 8740 cap screws, this assembly is rated for up to 750 horsepower. If you opt for the ARP 2000 cap screws, the rating increases to 1,500 horsepower.

What material are the pistons and connecting rods made from?

The pistons are constructed from 2618 forged aluminum, while the connecting rods are made from strong 4340 forged steel in an H-beam design.

Specifications

Brand: Manley Performance
Part #: 290140
UPC: 807298068718

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-t14-881242
Price: 3300.88 USD
Availability: BackOrder

$3300.88

On Backorder

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

Manley Performance SBC 383 rotating assembly. Features a 3.750" stroke with 4340 forged steel crank and rods for serious builds.

Key Features

Fits Small Block Chevy (SBC) engines with a 383 cubic inch displacement.
Features a 3.750-inch stroke crankshaft made from lightweight 4340 forged steel.
Includes 4340 forged steel H-beam connecting rods with 7/16" ARP 8740 cap screws.
Optional ARP 2000 cap screws are available for increased horsepower capacity.
Comes with 2618 forged aluminum Platinum Series pistons and premium chrome moly wrist pins.
Rated for up to 750 horsepower with standard ARP 8740 cap screws.

This rotating assembly is designed for Small Block Chevy (SBC) engines. Check manufacturer specifications to confirm 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

Manley Performance is well-known for making strong internal engine components, and this 383 cubic inch rotating assembly for Small Block Chevy engines is a prime example. If you're building a performance engine that needs to handle serious power, this package is designed to get you there. It includes everything you need to get your short block started, featuring a 3.750-inch stroke crankshaft, H-beam connecting rods, and flat-top pistons.

The heart of this assembly is the 4340 forged steel crankshaft, chosen for its strength and durability under high stress. Paired with it are 4340 forged steel H-beam connecting rods. These rods come standard with 7/16-inch ARP 8740 cap screws, which are rated for up to 750 horsepower. If your build is pushing the limits, you can opt for ARP 2000 cap screws, which can handle up to 1,500 horsepower, giving you a significant margin for high-output applications. The pistons are 2618 forged aluminum from Manley's Platinum Series, designed for performance and durability, and they come with premium chrome moly wrist pins.

This assembly is a solid foundation for a performance engine build. Keep in mind that this part is not CARB approved and cannot be shipped to California due to emissions regulations. Always refer to the manufacturer's installation instructions for proper assembly and torque specifications.