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Does anybody know where to get a 7" Overdrive crank pulley? My buddy has a stroked and poked, custom cammed, Dart blocked '88 with a 2.4 Blowzilla. With his setup, he's seeing 7-8 pounds of boost with his current pulley. He wants to crank up the boost with an overdrive crank pulley, which will put the blower just under 18,000 rpm at redline with his current snout pulley, but neither one of us is sure where to get an oversize crank pulley. Any help is appreciated!