Discussion Starter · #1 ·
has anyone used a 1989 or 1990 Mark IV 454 in a project acr or truck? I have been looking at water pumps and the references say the flow is in reverse from other Mark IV(65-87) water pumps. I am wondering if that is because of the external pulley system on 1989-91 454s or is it an internal design that is different? Every other major piece fits the similar on 1965-91 Mark IV 454s it seems except the long/short water pump.