A question

[1BadDodge71]

I recently fired up my 72 Duster,it has a slant six and for some reason,the exaust comes out the heat tube that connects to the air cleaner.What could be causing this?thanks

 

[busted knuckles]

Possibly the gasket between the intake and exhaust manifolds (where the two bolt together) is leaking. I just replaced mine with one from a company in australia, $11 bucks. Its not one of the stamped sheet metal p.o.s. I will try to post a link when I find it. Its over on www.slantsix.org


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Here are the good gaskets for the manifolds-to-head and the intake-to-exhaust (heat riser/hotbox) junctions.

 

[dartcuda]

Another problem could be a cracked manifold.

 

[rumblefish360]

Is the exhaust also coming out the tial pipe at a decent rate? I quick thought the flapper in the exhaust tube to be stuck mostly closed.

 

[1BadDodge71]

Is the exhaust also coming out the tial pipe at a decent rate? I quick thought the flapper in the exhaust tube to be stuck mostly closed.

No,mostly out the heat riser tube.

 

[MOPARJ]

I agree with the flapper. The 440-3 in the motorhome that my father and i co-own had a red hot right side manifold at night one time. It made the motor so hot that it fried the ignition coil. Well, i wired the flapper wheel into the open position to hold it. Lol, the next day(and i we have 3" flowmaster exhaust on it), i revved the motor in the morning to kick down the throttle on the carb and i heard something shoot out of one of the tailpipes. It was the damn flapper. Good thing i have less restrictive mufflers, or i would have had a problem trying to get it out. :sign6:

 

[1BadDodge71]

I found the problem.the gasket is bad and is leaking between the manifold and exaust flange.