What is the maximum horsepower this rotating assembly can handle?

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

What is the compression ratio achieved with these pistons?

The pistons have a +11cc dome, which contributes to the overall compression ratio. The final compression ratio will depend on your engine's bore size, head gasket thickness, and cylinder head combustion chamber volume. It's recommended to consult with your engine builder for precise calculations.

Are there any restrictions on shipping or use for this product?

Yes, this rotating assembly is not CARB approved and cannot be shipped to California due to emissions regulations. It is also subject to California's Prop 65 warning.

Specifications

Brand: Manley Performance
Part #: 290960HX
UPC: 807298115481

Manley Rotating Assembly, SBC 383 3.750 STROKE/+11cc DOME

Name: Manley Rotating Assembly, SBC 383 3.750 STROKE/+11cc DOME
Brand: Manley Performance
SKU: manley-performance-manley-rotating-assembly-sbc-383-3-750-stroke-11cc-dome-t14-881161
Price: 3563.16 USD
Availability: BackOrder

$3563.16

On Backorder

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

Manley Rotating Assembly, SBC 383 3.750 STROKE/+11cc DOME. Built for up to 1500 HP with optional ARP 2000 bolts.

Key Features

Fits Small Block Chevy (SBC) engines.
Features a 4340 forged steel crankshaft with a 3.750 inch stroke.
Includes 4340 forged steel H-beam connecting rods with 7/16" ARP 8740 cap screws.
Comes with 2618 forged aluminum Platinum Series pistons with +11cc domes.
Includes premium chrome moly wrist pins.
Rated for up to 750 horsepower with ARP 8740 bolts, and up to 1,500 horsepower with optional ARP 2000 bolts.

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

⚠️ 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 a 4340 forged steel crankshaft, this Manley rotating assembly is built for serious performance in your Small Block Chevy engine. The 3.750-inch stroke combined with +11cc dome pistons creates a 383 cubic inch displacement, a popular choice for a significant power increase over stock. This assembly is designed to handle substantial horsepower, rated up to 750 HP with standard ARP 8740 cap screws, and an impressive 1,500 HP when you opt for the ARP 2000 series cap screws.

The connecting rods are also forged from 4340 steel in an H-beam design, known for its strength and rigidity under high stress. They come equipped with 7/16-inch ARP 8740 cap screws, with the option to upgrade to even stronger ARP 2000 bolts for those pushing the limits. Complementing the crankshaft and rods are 2618 forged aluminum pistons from Manley's Platinum Series. These pistons feature a +11cc dome to achieve a desired compression ratio and come with premium chrome moly wrist pins, which are lighter and stronger than standard steel pins.

This rotating assembly is a well-built foundation for a high-performance engine build. Please note that this assembly is not CARB approved and cannot be shipped to California. It's crucial to consult with your engine builder to ensure this assembly meets your specific build goals and requirements.