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A recent thread made me question if I have the correct water pump pulley diameter. There seems to be two sizes available for the big blocks, 6.750" or 5.938" Which would be the desired pulley diameter?

First off, my car doesn't have a cooling issue. Ever. To boot, it was in the 50's yesterday. Car is a 440, twin electric fans and an aluminum radiator. On my way home from the gym, (car sat for 30+ minutes) I got a few miles from the gym and noticed I was at 220, which isn't normal and...

So my GVOD controller took a ****. I have a new one on order. This has however exposed a cooling issue. My car has 4.56 gears with 28" tall tires. It has a GPS speedo so 55mph is 3,000 RPM. Around town, at idle and slower speeds with fan on it's fine. 180ish. On the highway it will...