The heat to the intake provides a stable environment for the A/F mix regardless of what the outside temps may be. Carbs "like" a stable environment to operate in otherwise the performance might be erratic due to wide variations in operating conditions.

 

Excellent point. Use this advice.

 

I'm in Texas and the heating plate makes a huge difference. It's pointless to even tune the truck until it's run for 10-20 minutes and completely warmed up, there's that much difference.

Maybe having the carb reversed works better. Try it both ways once you get heat to the intake. The secondaries will probably never open all the way, so maybe they work better on the smaller, shorter path to the engine. Just cause it ain't normal don't mean it's wrong.

 

How do you plumb the heater hoses thru the plate? In the winter I see no trouble but during the summer I have a cut off valve.

 

Simply bypass the heater core and go directly to the plate for the summer and then reroute to the core for winter use.

 

You are simply putting a splice in the heater hose...cut the hose, put one end on one of the pipes and the other end on the other pipe and you are good to go. No need to change anything between summer and winter. The stable environment in the intake is desirable regardless of the season.

 

But in the summer if you don't cut off the water flow on an early truck (64) you'll get heat coming from the heater. I guess I can rig up a heater bypass by using three manual cut off valves.

 

Hmmmm...sounds like old-time diesel trucks when we had to shut off the water to the heater.