What is the horsepower limit for this rotating assembly?

With the standard ARP 8740 cap screws, this assembly is rated for up to 750 horsepower. If you opt for the ARP 2000 series cap screws, the assembly can support up to 1,500 horsepower.

What material are the crankshaft and connecting rods made from?

The crankshaft is constructed from lightweight 4340 forged steel. The connecting rods are also made from 4340 forged steel in an H-beam design for added strength.

Are there any restrictions on shipping this product?

Yes, this product is not CARB approved and cannot be shipped to California due to emissions regulations.

Specifications

Brand: Manley Performance
Part #: 290140RX
UPC: 807298114897

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-t14-881248
Price: 3438.08 USD
Availability: BackOrder

$3438.08

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, part# 290140RX. Includes forged crank, rods, and pistons for up to 1500 HP.

Key Features

Fits Small Block Chevy (SBC) 383 engines with a 3.750 inch stroke and -4cc flat top pistons.
Features a lightweight 4340 forged steel crankshaft for strength and reduced rotational mass.
Includes 4340 forged steel H-beam connecting rods with 7/16? ARP 8740 cap screws.
Equipped with 2618 forged aluminum Platinum Series pistons.
Comes with Premium Chrome Moly wrist pins.
Supports up to 750 horsepower with standard ARP 8740 fasteners.

This rotating assembly is designed for Small Block Chevy (SBC) 383 cubic inch engines. Please verify compatibility with your specific engine build and components.

⚠️ 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

This Manley Performance rotating assembly is built for a Small Block Chevy (SBC) 383 cubic inch engine, featuring a 3.750 inch stroke and -4cc flat top pistons. It's a well-built package designed for builders looking to significantly upgrade their engine's internal strength and power potential.

At the heart of this assembly is a lightweight 4340 forged steel crankshaft, chosen for its strength and ability to handle higher RPMs and increased cylinder pressures. Paired with this are 4340 forged steel H-beam connecting rods. These rods are robust and come equipped with 7/16? ARP 8740 cap screws, known for their reliability. For those pushing the limits, there's an option to upgrade to ARP 2000 series cap screws, which can support even higher horsepower levels.

The pistons are Manley's 2618 forged aluminum Platinum Series, designed for performance and durability. They come with Premium Chrome Moly wrist pins, which are strong and lightweight. This combination of components allows the assembly to handle a horsepower range of up to 750 with the standard ARP 8740 fasteners, and an impressive 1,500 horsepower when equipped with the optional ARP 2000 cap screws. This assembly is not CARB approved and cannot be shipped to California.