Small block water pump pulley

Joe, isn't the a/c pulley smaller diameter to drive the WP faster?

it is. but its also shallow like the pic with the tape measure makes it look. unless he has pictures of two different pulleys posted. maybe its just an optical illusion. his first pick it looks like a 70-up non a/c pulley. then the second pic makes it look like an a/c pulley with how shallow it is.