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underdrive pulley system?

Sep 30, 2009 by FAZZIO | Posted in Maintenance & Repairs

what is it/does it do? is it a stock engine part?

Smaller crank pulley with larger accessory pulleys

It reduces torque required by accessories on crank and "under-drives" the accessories.

Aftermarket parts.

StreetlegalTV.com-Powerbond Underdrive Pulley Systems

Powerbond talks about their latest in Underdrive Systems for the LS1, LS7, FBodies and Trucks streetlegaltv.com

How to Install Underdrive Pulleys (4.6L Mustang)--AutoHow.TV

www.autohow.tv Follow this link for a higher quality version of the video and a detailed parts list. From the AutoHow.TV site: "Warning: don ...