Manifold Heater for Cold Climates

cchrishefish said
A member from Aussiespeed just informed me to block off the third tapped hole in the manifold heater. They put it there in order to install a heat sending unit ETC. Therefore, I believe a tap into either of the two heater hoses will work out fine. I did see someone tap into the water pump hose, or a thermostat housing. But, this may not be the best option for a slant in order to make the install look good. I believe the heater hose would allow for the cleanest install.

I have water heat on a super six intake that I have on my ‘83 D150 / Slant with Dual Dutra’s.
I converted the EGR cavity on the bottom side of the intake into a sealed water chamber by using a steel plate as a cover on the bottom side. There is a second steel plate on the out side. Each plate has a fitting taped into it. I used hard 3/8 tubing as the water lines. My 83 head had an unused sensor hole on the top side near the thermostat housing ( was used for a Lean Burn sensor) that became the water out to the chamber. For the water return I T’d into the heater hose that returned water with the T near the water pump. The lines that I used is the formable brake line sections available at auto parts shops.
Don’t get me wrong, heater hose T’d into the regular heater hoses would work, probably have more flow, I was just presenting an alternative method. I left one of my 3/8 lines unconnected and started the motor, there was a lot of flow,,