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The main difference is that there is an open area under the plenum chamber
These drives fit under your stock timing cover and come complete with instructions
while delivering increased engine vacuum
turbocharged and nitrous applications
This is a preloaded unit allowing for a faster-reacting unit
Chevy SBC Billet Aluminum Short Water Pump SWP Serpentine Pulley The main difference is thatSpeedmaster aluminum crankshaft pulleys are manufactured from 356 aluminum that is heat treated to T 6 specs. These Speedmaster aluminum crankshaft pulleys help to increase horsepower by reducing accessory drag.
US$ 157.50
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