I have an ATI balancer on my 408,it sticks out about 1/2 inch to much to line up with the water bump pully(pullys are March)I had to buy a 1/2 adapter for the waterpump/fan from Flex-a-lite to get them to lineup.These ATI dampners aren,t cheap,so you,d think they would line up properly for the cost?:angry7: