Been apart to long or bad memory?

[Warrens69GMC]

The heat riser always goes on the driver side, and the shaft I believe is in parallel to the block.

[FirstOwner69]

Driver's side on my original 350. Here's a picture before the disassembly. I believe the passenger cars were on the right.

[Stocker]

My K20 originally had it on the passenger side...

[FirstOwner69]

Originally Posted by Stocker

My K20 originally had it on the passenger side...

Interesting. I wonder if the 4WDs had them opposite the 2WDs. Mine is a C20 and it was on the left since new. I know the manifolds are different, so it could be.

[Stocker]

Originally Posted by FirstOwner69

Interesting. I wonder if the 4WDs had them opposite the 2WDs.

That's kinda what I was thinking. Don't know for sure, though....

[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.
Posted via Mobile Device

[Stocker]

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.

I can't recall.... but didn't the tube come up from the manifold that had the heat riser valve? I still have all the original tin, and I thought it came up from my pass. side, same side my heat riser was on before I removed it.

Edit: I know it goes to the snorkel, which in the pic above is to the driver's side. ... just thinking my snorkel may have been to the pass. side, but it's been way too many years ago for me to remember.

[FirstOwner69]

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.
Posted via Mobile Device

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