So I disassembled my pump and noticed on the impeller side of the bowl the leading edges of the vanes are very rounded and worn. My question is , are they supposed to be sharp? And if so can I grind them with a die grinder to sharpen them and to smooth out the casting? Is it worth the time doing this or should I just leave it alone. The pump is an AT 309 in a 20.5 closed bow Advantage Classic, with a mild 454 BBC, 10-1 comp mild cam lighting headers. I lost the thrust bearing and ate up the impeller pretty badly, got lucky no other damage. Shaft is straight and there isn't any bluing, the suction housing doesn't have any wear. Which is surprising considering how bad the impeller is worn. I will try to post some pics. Any help will be appreciated, I am trying to get it back together for the fourth. If I don't get it back together I will be floating at the river regardless. I guess I can drink more beer then. 

Thanks again,
Pat