Quote:
Originally Posted by Gobuffalo
First owner is correct. Lift side.
Missing from that picture is all of the heat stove tin and the tube to the manifold. That is why the heat riser is in that side.
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Just to set the record straight regarding my post #4 picture...
The only thing missing from original in the picture is the heat shield above the 2 front plugs to protect the wires from the manifold heat. The heat stove and tin are not missing. It's a 69 3/4 ton and never had the stove and tube, only the PCV valve and carb collar with the hose to the flame arrestor on the right valve cover. The truck was produced in Fremont, CA, and I bought it new in Yorba Linda, CA. I seem to recall that some (all?) 1/2 tons had the heat stove on them in 69, but I'm not sure what year they actually started on the 1/2 tons. 1967-1972 was a period of rapidly changing emissions regulations, especially in California, and for a while, the higher GVWR trucks had less stringent requirements. So, what's correct for one year is not necessarily correct for every year or, for that matter, every geographic location.
Back on topic. I don't think any of this affects where the heat riser is placed. Its purpose is to force heated exhaust under the carb to speed warm-up and prevent carburetor icing. I don't believe there is any relationship with the heat stove and tube.
Jim