Exhaust 305

79 USA 1

79 USA 1

G-Body Guru
Sep 2, 2011
606
93
Cheektowaga, New York
Take the manifold to any good auto parts store or muffler shop and ask for a graphite doughnut gasket. I looks like someone removed the EFE valve and replaced it with the iron doughnut you have there, problem is there is no way to locate it when you attach the exhaust pipe. EFE valve looks like the picture below .
 

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RustBucket

RustBucket

Greasemonkey
Feb 8, 2018
202
28
Houston, TX
I think the pipe flange side is the one that would have the fitments on it. My manifold is just a flat surface.
 
79 USA 1

79 USA 1

G-Body Guru
Sep 2, 2011
606
93
Cheektowaga, New York
The valve would have a thermal switch usually on the thermostat housing and a vacuum source at the base of the carb. If you were to go to a good parts store or muffler shop they should be able to sell you a donut that looks similar to this that would lock into the manifold and the exhaust pipe would bolt to it.
Capture (640x523).jpg
 
Jorge1958

Jorge1958

Greasemonkey
Mar 2, 2019
229
43
Columbia City Oregon
It is a graphite gasket from what i saw. Buy a new graphite gasket from NAPA. New studs and nuts to and make sure your header pipe is round and not oblong.
 
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RustBucket

RustBucket

Greasemonkey
Feb 8, 2018
202
28
Houston, TX
The valve would have a thermal switch usually on the thermostat housing and a vacuum source at the base of the carb. If you were to go to a good parts store or muffler shop they should be able to sell you a donut that looks similar to this that would lock into the manifold and the exhaust pipe would bolt to it.
View attachment 146110
Is yours for a 305?
It is a graphite gasket from what i saw. Buy a new graphite gasket from NAPA. New studs and nuts to and make sure your header pipe is round and not oblong.
I had a muffler ahop replace the atuds about a year ago. I took the manifolds right when i removed them from a cadillac limousine. Never tried them on before they replaced the studs. I dont think anything is wrong with my donut. I just think it's missing a gasket or something. Its mating metal on metal.
 
79 USA 1

79 USA 1

G-Body Guru
Sep 2, 2011
606
93
Cheektowaga, New York
Is yours for a 305?

I had a muffler ahop replace the atuds about a year ago. I took the manifolds right when i removed them from a cadillac limousine. Never tried them on before they replaced the studs. I dont think anything is wrong with my donut. I just think it's missing a gasket or something. Its mating metal on metal.



The picture was off the web.
My blue 79 has a 267 with Hooker long tube headers so all the factory manifolds and thermo switches are gone. I do have an 88 SS with the 305 and stock manifolds. I also have the EFE still in place but the metal flap is removed. The EFE valve has ears that locate in the exhaust studs. You can get a gasket from someplace like NAPA but just understand the steel donut has nothing to locate in the manifold with. What you have is a round ring that you are hoping stays on the gasket when you attach the pipe to it.
 
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RustBucket

RustBucket

Greasemonkey
Feb 8, 2018
202
28
Houston, TX
The picture was off the web.
My blue 79 has a 267 with Hooker long tube headers so all the factory manifolds and thermo switches are gone. I do have an 88 SS with the 305 and stock manifolds. I also have the EFE still in place but the metal flap is removed. The EFE valve has ears that locate in the exhaust studs. You can get a gasket from someplace like NAPA but just understand the steel donut has nothing to locate in the manifold with. What you have is a round ring that you are hoping stays on the gasket when you attach the pipe to it.
ok I kind of understand what you're saying now. I'll take a video tomorrow and show u my y pipe flange.

by the way, what is the difference between a SS 305 and a stock 305?
 
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