does anybody know what the heat riser tube is?????

 

If you're referring to the tube coming off the #6 exhaust outlet & going to a plate below the base of the carb, I believe it's actually an exhaust feedback, part of the EGR.

 

is this really needed. they said that i need to have that even though i just put on some headers

 

The tube is for exhaust gas recirculation (EGR) a required part of the emissions system - if "they" say so. Edelbrock makes an EGR adaptor plate (Jegs PN 350-8053) and I found that the '80's 4 bbl 351w had one I could use. You may have to have a bung welded to your headers to allow replumbing the tube - bummer...

 

its ok i get a new intake and carb in a few days so i should be good on that. and i have found a place that will "check" to see if i have it and i should be able to pass next time

 

also if you have a carb it will keep it from icing up

 

Guys: You're confusing the EGR system with "CARB/CHOKE HEAT TUBE"

The heat riser tube is used on OLDER vehicles with Carburators to help with Choke spring coil release. This was the first iteration of the "Automatic Choke". Early versions also used a spring/rod assy buried in the intake manifold connecting the choke rod to the spring.

Later Automatic chokes used a combination of ported vacuum and heated coil and then an electrically heated spring coil.

Most shops (Napa, etc) will have a Heat tube conversion kit, or you can actually get a electrical choke conversion. Use a switched 12V wire and you're good to go. You won't need the heat tube them.

Larry

 

...or Larry is he referring to the exhaust diversion up into the "heat riser" runner inside the intake from the exhaust manifold - controlled by the spring and counterwieght built into the manifold?

 

Never saw them on any of the Ford Six's I owned. Who knows, he might be talking about the hot air plenum for the gas fired heater on a Corvair for all we know.

 

I recall all those doo-hickeys on my '82. The heat riser tube for the vacuum from underneath was pressed in and started out between the #4 and 5 cylinder. The choke heater tube from the top to the choke assembly... stupid fittings never went back in right... always having to buy an new one and it had some asbestos insulation wrapped around it. Then there was that wonderful flapper spring valve thing-a-jiggy... never had a problem with it. Then there was the corregated aluminum and cardboard tube from the exhaust manifold to the air intake on the filter box. Are these necessary? Probabbly not, but if you want the engine to run right with old carb.... well then I guess they are.

-Kerry