We had 3 carter all hipo new.2 BBs and 1 Sb.One never worked out of the box.1 was on the 413 for like 100 miles and the spring on the arm popped and it quit.Lucky we got the spring out of the pan.1 ran for like 1 hour on my 440.went back to my hipo Holey pumps.Had one I bought in the 70s that ran better than a new carter.Now we run all Holleys.rocky