I HAVE AN ATI PROCHARGER ON MY 91 Z28 AND 383 STROKER. I HAVE CUSTOM BUILT A HUGE INNER COOLER AND ALSO AN ALUMINUM 2 ROW RADIATOR. I LIKE THE WAY THE OE FANS FIT AND THERE'S NOT MUCH ROOM FOR ANYTHING ELSE ANYWAY THAT MOVES AS MUCH AIR. I WAS JUST LOOKING AT ECKLERS FOR VETTES & CAMAROS AND NOTICED THAT 91 FAN MOTORS LOOK VERY SIMILIAR EXCEPT VETTE APPEARS TO BE A TOTALLY ENCLOSED MOTOR. ANY BODY POSSIBLY KNOW IF THESE MOTORS ARE PERHAPS MORE AGGRESSIVE RPM WISE FOR MORE AIR? SURE LOOK LIKE THEY WOULD FIT.