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Old 09-11-2012, 04:16 AM
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75gmck25 75gmck25 is offline
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My '75 SBC with HD cooling had the type of pulleys you are looking for. The water pump has a two groove pulley, and with HD cooling the PS belt goes over both the crankshaft and the water pump. When I look up the parts number for a PS belt there are two options, a short and a long belt. Both will work, but only the long one routes around the water pump.

I am running the long PS belt because it keeps the water pump running even if I break the alternator belt. I've had the alternator belt break once on the highway when I was running the short PS belt and it only took about five seconds for the water temp to get into the red once the water pump and fan stopped turning.

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