[PontiacHO]

Are all 8 bolt water pump pulleys the same diameter? Wondering if the air conditioned cars had a smaller pulley to increase fan speed? Car stays at 180 regardless of ambient temperature as long as it’s rolling however temperature rises quickly when stopped. Currently have 7 blade fan, Hayden heavy duty clutch, stock shroud, upper baffles (not lower), largest Cool Case radiator that will fit, water pump plates clearanced, and initial timing at 12 degrees with full manifold vacuum advanced. This is for my 1968 Firebird 350, stock, 066 cam with factory exhaust manifolds and dual exhaust. I fret when in traffic on hot days…