You want to squeeze out every last bit of acceleration and horsepower from your engine. Here it is. This lightweight crankshaft pulley is manufactured in the USA. This pulley is the same size as stock, so no belt changes needed. The stock crankshaft pulley on this engine weighs ten 10 pounds. Our end product weighs just 2.5 pounds. That means the stock pulley weighs 7.5 pounds more than ours. There are a few Internet sources that claim for every pound reduced in the rotational mass of the crankshaft assembly; you gain 2.7 acceleration horsepower. If you want the last bit of power out of your 5vz, then this pulley may be for you! We recommend this pulley for performance applications only.
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