I've got a real dilemma on my hands. Last fall during a routine inspection of the engine on the 310 (chevy 454) I noticed that the A/C belt was flipped in the groove. At the time I didn't do anything about it as we weren't planning on driving it until spring.
So today I decide it's time to replace the belt. I loosely install the first belt which is the A/C to Water Pump to Crank to Power Steering. While routing around the water pump I just happened to notice (by touch) that the belt seemed to be resting against the water pump outlet. I used my bore scope to take these two pictures. One picture sure seems to show the belt being deflected slightly by the water pump. The other also seems to show it touching.
Here's a couple of pictures of the Argosy motor sitting on the test stand. There is a clear separation between the belt and the water pump casting.
I know there are shims that can be used to shim the water pump pulley farther forward but they are used to align the water pump pulley with the crank pulley. I don't believe there is an alignment issue although I will try and verify that tomorrow.
The only thing I can think of is there are different castings for the 454 tall water pump and this one is just a bad casting. I do know the engine was replaced back in 2000 with a factory crate engine. I'm fairly certain the water pump on the engine right now is the one that was installed back in 2000. We broke the AC belt last spring on a trip and I replaced it while on the side of the road. The belt that I just removed because it had flipped in the groove is the belt I replaced last spring.
I'm guessing it flipped because of the rubbing against the water pump casting.
At this point the only thing I can think of doing is replacing the water pump and making sure I get one that has the same profile as the one on the Argosy 454.