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Here’s a good example of what can happen when you start combining different pulleys, accessories and such. The Weiand aluminum water pump has a fairly large housing area so the AGC pulley wouldn’t clear it. Luckily the stock GM pulley did and we were back in business. Since our engine is stock internally, spinning the water pump a bit slower should be okay. Once the A/C condenser is added in front of the radiator though, we may have cooling issues. Time will tell, but for now it’s fine.