What is the horsepower limit 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 horsepower capability increases to 1,500.

What material are the crankshaft and connecting rods made from?

Both the crankshaft and the H-beam connecting rods are constructed from 4340 forged steel, a material known for its strength and durability under high stress.

Are there any shipping restrictions for this product?

Yes, this rotating assembly is not CARB approved and therefore cannot be shipped to California.

Specifications

Brand: Manley Performance
Part #: 290740R
UPC: 807298071329

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-t14-881284
Price: 3379.80 USD
Availability: BackOrder

$3379.80

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 355 rotating assembly with 3.480" stroke. Features forged steel crank and rods for high-horsepower builds.

Key Features

Fits SBC 355 engines with a 3.480-inch stroke.
Includes a lightweight 4340 forged steel crankshaft.
Features 4340 forged steel H-beam connecting rods with 7/16" ARP 8740 cap screws.
Supports up to 750 horsepower with standard ARP 8740 cap screws.
Optional ARP 2000 cap screws allow support for up to 1,500 horsepower.
Includes 2618 forged aluminum Platinum Series pistons with premium chrome moly wrist pins.

This rotating assembly is designed for SBC 355 cubic inch engines with a 3.480-inch stroke. Always verify compatibility with your specific engine block and intended build 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 Manley Performance rotating assembly is built for SBC 355 cubic inch engines, featuring a 3.480-inch stroke. It's a well-built package designed to handle serious power, making it a solid choice for engine rebuilds where performance is key. The components work together to form the heart of your engine, converting combustion into rotational force.

At its core 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. These rods come standard with 7/16-inch ARP 8740 cap screws, a strong setup capable of handling up to 750 horsepower. For those pushing the limits even further, optional ARP 2000 cap screws are available, allowing this assembly to support up to 1,500 horsepower. The pistons are Manley's Platinum Series, made from 2618 forged aluminum for a good balance of strength and light weight, and they include premium chrome moly wrist pins.

This assembly is a significant upgrade for any SBC build aiming for higher horsepower figures. It's important to note that this assembly is not CARB approved and cannot be shipped to California. Always refer to manufacturer specifications for complete build details and compatibility with other engine components.