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We found the best results running Weiand's 3.07-inch blower pulley and a 7-inch crank pulley (2.33:1 overdrive), making 650-plus hp on 105-octane unleaded gas. We also made 562 hp and 556 lb-ft at 6-psi boost by limiting top-end rpm to just 5000 with the same drive combination on 91-octane. View Related Article
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