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Making the big power came from swapping out the stock 6-inch crank pulley included in the system for the larger 7.8-inch piece.
Crate Engine Confessional - GM Performance Parts ZZ383 Dyno Test

 Making the big power came from swapping out the stock 6-inch crank pulley included in the system for the larger 7.8-inch piece.  View Related Article

 

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Source Interlink Media © 2008 Chevy Hi-Performance,
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