heat riser tube
Elder User
Joined: Mar 2003
Posts: 628
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From: Colorado
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...
Elder User
Joined: Apr 2001
Posts: 772
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From: Glen Burnie Maryland
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
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
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Senior User
Joined: Oct 2003
Posts: 215
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From: Central Coast, CA
...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?
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Postmaster
Joined: Jul 2001
Posts: 4,038
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From: South Kitsap County, WA
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
-Kerry
Last edited by kspilkinton; Apr 9, 2004 at 08:14 PM.
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