I got the 3 1/8" tall 3991423 BW water pump pulley for my 78 L-48 and tried to mate it to my old incorrect water pump and it rubbed against the housing. So I bought a new pump with ACD# 251-185 and GM# 12307829 on the box and the pulley rubs on this one too. 30998 and ACI are stamped on the pump. The pulley is the correct one according to the judging manual and Delco says this pump is for 78 corvettes but they don't fit. Does anyone have any ideas?
Bill
Bill
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