What is the purpose of a crank hub?

A crank hub connects the crankshaft to the harmonic balancer. It's crucial for mounting the balancer correctly and helping to control engine vibrations.

Why is this crank hub .005 undersize?

The .005 undersize specification means the hub is slightly smaller in diameter than standard. This is often used when the crankshaft snout has been machined down during a rebuild to achieve a tighter, more precise fit with the harmonic balancer.

What does 'external balance' mean for this part?

External balance refers to how the engine's rotating and reciprocating masses are counterweighted. This hub is designed to work with engines that have counterweights added to the crankshaft or flywheel/flexplate for balance, rather than internal counterweights on the crankshaft itself.

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Specifications

Brand: ATI
Part #: ATI916070-2U
UPC: 800157023620

ATI Crank Hub & Inner Shell - Steel - Chevy 400 SB - Ext Bal .005 Undersize

Name: ATI Crank Hub & Inner Shell - Steel - Chevy 400 SB - Ext Bal .005 Undersize
Brand: ATI
SKU: ati-ati-crank-hub-inner-shell-steel-chevy-400-sb-ext-bal-005-undersize-t14-360648
Price: 190.99 USD
Availability: BackOrder

$190.99

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ATI Crank Hub & Inner Shell for Chevy 400 SB. This steel component is .005 undersize for external balance applications.

Key Features

Fits Chevy 400 small block engines.
Steel construction for durability.
Designed for external balance applications.
Includes inner shell.
This part is .005 inch undersize for the crankshaft snout.

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About this part

Product Details

If you're rebuilding the crankshaft assembly for your Chevy 400 small block, a solid crank hub is essential for proper damper function. This steel crank hub and inner shell from ATI is designed to work with external balance configurations and comes .005 inch undersize, which is important for ensuring a precise fit on the crankshaft snout.

Crafted from durable steel, this component is built to withstand the stresses of engine operation. The .005 undersize specification means it's intended for crankshafts that have been machined to a slightly smaller diameter, often done during a performance rebuild to achieve tighter tolerances. Proper installation of this hub is key to the effective operation of your harmonic balancer, helping to control torsional vibrations and protect your engine.