rochester gasket help
Thread Starter
Burning Brakes
Joined: Jul 2009
Posts: 935
Likes: 20
From: Indianapolis Indiana
rochester gasket help
I was switching rochesters on my car and realized the car came to me with two gaskets on the intake.
A metal one and a normal gasket.
Can anyone tell me what the metal one is for and do I need it?
Does the metal one go on first or the regular gasket?
I ask this cause I could hear a big air leak at the gasket this time where I hadn't heard it before.
thanks for the help
jim
A metal one and a normal gasket.
Can anyone tell me what the metal one is for and do I need it?
Does the metal one go on first or the regular gasket?
I ask this cause I could hear a big air leak at the gasket this time where I hadn't heard it before.
thanks for the help
jim
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
The steel goes against the bottom of the carb , then the gasket.
edit - Aluminum intake ? I don't think the SS one I'm thinking about is used on the aluminum intake.
Last edited by ...Roger...; Oct 6, 2010 at 11:05 PM.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Better back up and tell us what engine you have.
Is this what you have ?
http://www.ecklers.com/corvette-carb...1968-1969.html
http://www.ecklers.com/corvette-carb...1968-1969.html
Is this what you have ?
http://www.ecklers.com/corvette-carb...1968-1969.html
http://www.ecklers.com/corvette-carb...1968-1969.html
Last edited by ...Roger...; Oct 6, 2010 at 11:11 PM.
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,391
From: At my Bar drinking and wrenching in Lafayette Colorado
If you have the "smiley-face" exhaust crossover intake manifold, you have to use a 2-piece gasket set, although I recommend a 3-piece. All the info for this, including part numbers, sources, and costs, are in my paper titled "Q-Jet Base Gasket Info." Paper is available by e-mailing me a request:
V8FastCars@msn.com
Lars
V8FastCars@msn.com
Lars
Thread Starter
Burning Brakes
Joined: Jul 2009
Posts: 935
Likes: 20
From: Indianapolis Indiana
I have a L36 427 manual transmission.
I have the two above gaskets exactly. Except my metal one does not have the two smaller tabs on the side with the small circles. I am not sure if those tabs have a function or not.
This all starts out from me having three carbs.
A 68 corvette carb that came with the car and I was told it was the original but it has a stripped fuel inlet.
A 75 automatic 350 carb from a truck that was on the engine.
A carb bought off ebay that was supposed to be a replica carb.
None of the three have the same base plate.
The 75 carb doesn't seem to work very well and the new carb is much worst.
I called today and asked around, and even though one place said my 68 carb could not be fixed with a heli-coil, another place said they do it all the time and it was no problem.
I guess I am going to get it helicoiled and rebuilt. I figure it should be the closest. Just take the new carb as a lesson learned.
I will email you now Lars for the information.
thanks
jim
I have the two above gaskets exactly. Except my metal one does not have the two smaller tabs on the side with the small circles. I am not sure if those tabs have a function or not.
This all starts out from me having three carbs.
A 68 corvette carb that came with the car and I was told it was the original but it has a stripped fuel inlet.
A 75 automatic 350 carb from a truck that was on the engine.
A carb bought off ebay that was supposed to be a replica carb.
None of the three have the same base plate.
The 75 carb doesn't seem to work very well and the new carb is much worst.
I called today and asked around, and even though one place said my 68 carb could not be fixed with a heli-coil, another place said they do it all the time and it was no problem.
I guess I am going to get it helicoiled and rebuilt. I figure it should be the closest. Just take the new carb as a lesson learned.
I will email you now Lars for the information.
thanks
jim
Thread Starter
Burning Brakes
Joined: Jul 2009
Posts: 935
Likes: 20
From: Indianapolis Indiana
Thinking about it more. Another guy told me the bottom plate of the 68 carb wasn't correct.
Anyone able to look at these three carbs and say if any of them are correct for a 69?
Also, if the 68 is incorrect will it work fine?
68 427 carb
http://i392.photobucket.com/albums/p...tte/68carb.jpg
75 truck 350 carb
http://i392.photobucket.com/albums/p...tte/75carb.jpg
One purchased from Ebay (epic fail)
http://i392.photobucket.com/albums/p...te/newcarb.jpg
thanks
Anyone able to look at these three carbs and say if any of them are correct for a 69?
Also, if the 68 is incorrect will it work fine?
68 427 carb
http://i392.photobucket.com/albums/p...tte/68carb.jpg
75 truck 350 carb
http://i392.photobucket.com/albums/p...tte/75carb.jpg
One purchased from Ebay (epic fail)
http://i392.photobucket.com/albums/p...te/newcarb.jpg
thanks
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Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,391
From: At my Bar drinking and wrenching in Lafayette Colorado
Any of those carbs can be set up to run just fine - there is no issue with manifold/gasket fitment to the carbs provided the correct gasket set is used as outlined in the info I e-mailed you. You can see that the truck carb has been run on a "smiley-face" intake manifold without use of the correct gasket - you can see where it has been ingesting exhaust gas with a huge vacuum leak, so that carb was probably running like crap without the right gasket set.
Lars
Lars