66 fan spacer to shaft mount distance

[Greg]

Hello,

I just rebuilt my water pump but I accidently wiped away the measurement from the old pump. 
How far should the shaft stick out past the spacer mount?

Thank,
Greg

[Greg]

bmp

[Bob Gaines]

Hello,

I just rebuilt my water pump but I accidently wiped away the measurement from the old pump. 
How far should the shaft stick out past the spacer mount?

Thank,
Greg

7/16 was nominal on about 10 I checked for consistency.