As per my other thread I am putting a SBO in an 85 MC SS. I am planning on running AC with this car. Which water pump (dimensionally speaking) do i need? I am using a Stock g-body radiator too, for reference. Thanks.

side note : the car will pretty much be g-body cutlass under the hood so as far as AC config, battery config, etc, it would be as if i am swapping a 350 into a cutlass and not a monte

 

The water pump and pulleys MUST match the accessory brackets you are using. Obviously the Chevy brackets off the Monte don't work, so you need a complete set. Your best bet would be to get the brackets from a 1980s Olds 307 and the water pump and pulleys to match. If you have earlier brackets, the pump will need to match those.

The G-body 307s used the 6" pump, but again that only works for you if you are using the matching brackets and pulleys.

 

thanks Joe, I have a 100% complete 307 sitting in my parts garage as well as loose 307 brackets somewhere. I was eventually going to send the brackets to the powdercoater anyway. Now i know what water pump i need.