Weird ? about small block pulleys

This is an interesting and informative thread! I bought a new water pump and fuel pump for my 273 build at NAPA the other day. I'm using the 70 and up configuration on the motor. The water pump that came looks like a Flow Cooler brand pump, but it's an all new everything deal. It has a 6-blade impeller with a solid face towards the timing cover, if that makes sense. Hopefully, I have one more set of non-AC single groove later pulleys in my stash, but if not it's good to know that I can get some from Bouchillon.
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