Whipple Supercharger 383 Small Block Chevy Engine Build Picking A Pulley Wheel
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Although we got great results with the 4.750-inch pulley our system came equipped with, we couldn't resist the urge to test the limits of our 383 test-mule, so we installed a 4.50-inch wheel followed by a 4.25-incher. Each 1/4-inch, according to Whipple, amounts to change in boost of about a 11/2 psi. The boost levels reported here were recorded on the dyno. View Related Article
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