You are sending hot water into the wrong side of the rancho valve. Walt.

John, have you had any trouble with your setup? I know I haven't.

Lance,
Nope, not one problem with the heater hoses routed the way I have it.

At Ken Cates Stepdown website, he has a picture posted there that shows the "correct" routing of the heater hoses. It's the same way I have mine routed. I'll let Ken post the picture if he feels so inclined.

John

The following is from the O'Forum

Park_W Senior Contributor

February 27 edited February 27 Posts: 2,448Flag

Cyl. head to the outboard Ranco valve connection, inboard Ranco conn. to upper heater core, lower heater core to water pump. There was a change with '51 model production that reversed the heater core connections, but if you believe you have the original 48-50 type heater core, you can stay with the original routing.

Per the manual, the '48-50 heater cores had an air vent at the top, so I assume one could check the type core by blocking one pipe and blowing into the other

following is the thread:

http://forum.hetclub.org/discussion/comment/203342/#Comment_203342

Exactly what I thought. Mine are routed the same way. When anyone asks about routing, thats the setup I recommend. No problems yet.

To beat a dead horse: the photo is correct for all cars after Sept 12, 1950. Before then the bottom heater outlet went to the pump. Heater valve inlet water always goes from engine to the top the top of valve. This is promulgated by Technical Service Bulletin # TS 77-16 on the website.