Hey guys, This is a bit of a long shot here but I am wondering the diameter of a water pump pulley for a 73 Chevy SBC (Camaro, Vette) I am wondering because I can not keep my car under 200 degrees and after swapping in a march pulley kit I think the one I have is too big so it spins the impeller too slow. GM Engine Block number - 3970014 Ive been chasing cooling issues for this car for a while now. If this isnt the fix Im thinking its internal to the motor. Things Ive tried 3 new radiators. This newest one is a 3 row aluminum. Different size electric fans with shrouds. The current setup is a pull fan with a shroud that covers about 90% of the radiator. Also, added a push fan on the other side, just for fun. They pull 18 amps A remote transmission cooler Wrapped headers Advancing the timing, with vacuum advance. Currently at 34, up to 50 with advance A/F ratio about 12.5 to 1 Flushing the system. Using a vacuum system to put new fluid in (several times) Pulling the thermostat, also a 160 and a 180 temp Filling the radiator on a hill, with the car jacked up to remove all bubbles When I removed the original fan shroud with clutch I regret not keeping them. Im pretty sure the car ran hot then. I only added a thermostat by the headers afterward.