Pulley Diameters
I measured the small block non-AC pulleys I have and got 6 7/8" for the water pump and 7 1/4" for the crank pulley. That was a single groove for the water pump and a double groove for the crank pulley.
On my '71 GT with a 318, power steering and AC the water pump pulley was 6 5/8", crank pulley was still 7.25". That was also a single groove for the water pump, and a triple groove for the crank pulley. The AC was driven by a double including the alternator, and a single belt drove the power steering and water pump. Here's a picture of the set up as it was when I bought it. The radiator wasn't original (for an early A) and some knucklehead used one of those stupid flex hoses.
I measured the small block non-AC pulleys I have and got 6 7/8" for the water pump and 7 1/4" for the crank pulley. That was a single groove for the water pump and a double groove for the crank pulley.
On my '71 GT with a 318, power steering and AC the water pump pulley was 6 5/8", crank pulley was still 7.25". That was also a single groove for the water pump, and a triple groove for the crank pulley. The AC was driven by a double including the alternator, and a single belt drove the power steering and water pump. Here's a picture of the set up as it was when I bought it. The radiator wasn't original (for an early A) and some knucklehead used one of those stupid flex hoses.
