What is the horsepower rating for this rotating assembly?

With the standard 7/16-inch 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 materials are the crankshaft, connecting rods, and pistons made from?

The crankshaft and connecting rods are constructed from 4340 forged steel for exceptional strength. The pistons are made from 2618 forged aluminum, chosen for its balance of strength and light weight in performance applications.

Does this rotating assembly come balanced?

Rotating assemblies typically require balancing by a professional engine builder to match the specific components being used, including the crankshaft, connecting rods, pistons, and flywheel/flexplate. It is recommended to have this assembly professionally balanced for optimal performance and engine longevity.

Specifications

Brand: Manley Performance
Part #: 290735RH
UPC: 807298080192

Manley Rotating Assembly, SBC 355 3.480 STROKE/-4cc FLAT

Name: Manley Rotating Assembly, SBC 355 3.480 STROKE/-4cc FLAT
Brand: Manley Performance
SKU: manley-performance-manley-rotating-assembly-sbc-355-3-480-stroke-4cc-flat-t14-881277
Price: 3463.81 USD
Availability: BackOrder

$3463.81

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 355 3.480 STROKE/-4cc FLAT. Built for high-horsepower builds.

Key Features

Fits SBC 355 engines with a 3.480-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-inch ARP 8740 cap screws.
Optional ARP 2000 cap screws are available for increased horsepower capacity.
Uses 2618 forged aluminum Platinum Series pistons designed for high-performance applications.
Comes with premium chrome moly wrist pins for durability.

This rotating assembly is designed for Small Block Chevrolet (SBC) 355 cubic inch engines. Please verify compatibility with your specific engine build and specifications.

⚠️ 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 is the Manley Performance SBC 355 rotating assembly, designed for builders looking to push the limits of their small-block Chevrolet engine. It features a 3.480-inch stroke and flat-top pistons with a -4cc dish, making it a solid foundation for a 355 cubic inch displacement. This assembly is engineered to handle serious power, offering a robust platform for both street and track applications where increased performance is the goal.

At the heart of this assembly is a lightweight 4340 forged steel crankshaft, chosen for its strength and ability to withstand high RPMs and significant stress. Paired with this are 4340 forged steel H-beam connecting rods, known for their durability. These rods come standard with 7/16-inch ARP 8740 cap screws, a well-regarded fastener for performance builds. For those aiming for the upper echelon of horsepower, optional ARP 2000 cap screws are available, allowing this assembly to reliably handle up to 1,500 horsepower. The pistons are Manley's Platinum Series, made from 2618 forged aluminum for a strong yet lightweight component, and they include premium chrome moly wrist pins for added longevity under demanding conditions.

This rotating assembly is a significant upgrade for anyone rebuilding or building a performance small-block Chevy. The combination of 4340 forged steel and 2618 forged aluminum components means you're getting parts that are built to last and perform. Remember that this assembly is not CARB approved and cannot be shipped to California. Always consult with your engine builder or refer to Manley's installation guidelines for proper assembly and balancing procedures to ensure optimal performance and durability.