What is your crank pully dia.
Crank dia / Waterpump dia x 100 = %
JUST NUMBERS FOR EXAMPLE
(6.5 / 6) x 100 = 108% or 8 percent overdriven
(6.5 / 6.75) x 100 = 96.3 or 3.7 percent underdriven
That will give you a ratio of crank to Waterpump. One i suspect will be underdriven and one will be overdriven.
The waterpump you have will need to match the situation.
Can't say for BB but in SB there us a relation like ( and someone correct me if i have this backwards) AC and HD cooling were overdriven BUT the waterpump had fewer vanes. Standard cooling was underdriven but had more vanes.
