small block Edelbrock water pump experiences

Thanks for that feedback. I was thinking I might go to the parts store and see if they would let me measure one. The pump I'm working with/measuring from appears to be a genuine Mopar casting (it's probably been sitting around the garage for 20 years). It has the Pentastar logo and has a casting number of 2951571. I think most of the "new" pumps you get at the parts store may be an overseas casting.