had an old round core in my 55.2 just got a deluxe heater to install, I did a search, and I know this has been covered before, so I'm sorry, but now I have a 5/8 and a 3/4 heater hoses,which one goes to the pump and to the intake manifold???,and again sorry,[before both were 5/8 and no heater control valve] Thanks This is a 55.2 with a 265
