Hello,  would anybody be able to tell me if I’m using the correct gasket on my Rochester throttle body? It doesn’t  look right to me.  I’m not sure if the carb actually ran with this gasket because I got it used with no history.  Any help would be appreciated 

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Comment by Phil on September 30, 2021 at 7:25pm

I did a little more reading,  apparently the casting number on the bowl isn’t vehicle specific, it is used to signify the bowl type before machining for the specific vehicles.  Also I read that certain cars use a “venting gasket” to help with hot idle and hot starts so maybe it’s possible that is the correct gasket.  

Comment by Phil on September 29, 2021 at 9:28pm

Thanks Mark, Good catch on the casting #. The when I search that number it does show up as as a Chevy,  it’s interesting because a Chevy throttle body is a lot different.  

Comment by Mark S Anderson on September 29, 2021 at 8:46pm

check the casting number 7028597.  I quick googled it and very little came up, except all of the listings showed that it belonged to a rochester 4gc on a chevy.  i don't know that this is reliable info, and my parts book is packed away, but i would suggest checking the bowl part # for the 63 and 64 against that 7028597.    I believe it's a carb made for another car.  But easily confirmed or denied with the parts book

Comment by Phil on September 29, 2021 at 7:48pm

I forgot to mention I did have the carb on my own car with that newer gasket, it ran like it had a terrible vacuum leak. I was hesitant to even try it but in the owners manual it shows that exact gasket. Is it possible that the manual  used a generic photo?

Comment by Mark S Anderson on September 29, 2021 at 11:49am

no, that gasket would induce vacuum leaks at each of the barrels.  you want a gasket without all the 'U' shaped cuts, that mimics the outline of the barrels.   This carb may have run, but would have been lean and not run off the idle circuits.  it was probably adjusted very rich to make up for the false air coming in.


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