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Re: stock crank, 3.7"pulley=10% od and what blower pulley?
7.5 crank/4" upper * 4.1 step up * 6500rpm=50k Impellar speed
7.5 crank/3.7" upper * 4.1 step up * 6500rpm=54K impellar speed
7.5 crank/3.4" upper * 4.1 step up * 6500rpm=58.7K impellar speed
Hope this helps.
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89 LX-NA 32v, 437rwhp NA
79 Coupe-Who knows
93 Typhoon-Daily
95 F350-Tow rig
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