water pump and pulley selection

6 impeller flow more water. 8 impeller flow less. Most original AC cars I took apart years ago had 6 with the small pulley. non AC were 8 with the larger pulley. I ran a 69 cast pump and earlier crank pulley on a 70 aluminum pump system to under drive the pump.

With a Fluidampr it is a bolt on belt alignment, with a standard damper you need a 1/4 inch spacer,