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Hello fellow vettors... I've had my '76 in storage for a few years and I'm just now getting back to working on it. I had the carburetor rebuilt several years ago but never installed it. Now I'm at that point but I don't know which gasket to use. These came with the rebuild kit I guess (I didn't rebuilt it, Lars did) but I'm not sure which I'm supposed to use. Any thoughts? Thanks again!
Last edited by mijohnst; Apr 20, 2018 at 12:56 AM.
Hello fellow vettors... I've had my '76 in storage for a few years and I'm just now getting back to working on it. I had the carburetor rebuilt several years ago but never installed it. Now I'm at that point but I don't know which gasket to use. These came with the rebuild kit I guess (I didn't rebuilt it, Lars did) but I'm not sure which I'm supposed to use. Any thoughts? Thanks again!
My 76 had the one on the left, when I took my carb. off. I used the new one when I put mine back on.
From: At my Bar drinking and wrenching in Lafayette Colorado
No - don't used the thin 4-hole on a '76. Use the thick, open-plenum gasket for your '76. The gasket on the left in your photo is correct for your application.
Lars to the rescue... I was just about to bold things thing on and I see you message. Thanks very much. I'm excited to try out the carb you rebuilt for me 2 years ago. lol
From: At my Bar drinking and wrenching in Lafayette Colorado
Originally Posted by mijohnst
Lars to the rescue... I was just about to bold things thing on and I see you message. Thanks very much. I'm excited to try out the carb you rebuilt for me 2 years ago. lol
If it's been sitting unused for 2 years, it probably isn't going to work well... The accel pump is likely shrunk and non-functional, and there may be dried fuel deposits in the passages... you can't put a carb that's been fuel-soaked on the shelf for that long - they don't store well.
Lars, I haven't run any gas through it since I've received it from you a while back. It might have had something left over from when you tested it out which is what you're likely referring to. Does this mean that I need to send it back to you or should I just proceed and see what happens?
Originally Posted by lars
If it's been sitting unused for 2 years, it probably isn't going to work well... The accel pump is likely shrunk and non-functional, and there may be dried fuel deposits in the passages... you can't put a carb that's been fuel-soaked on the shelf for that long - they don't store well.
Lars
Last edited by mijohnst; Apr 23, 2018 at 11:10 AM.
No - don't used the thin 4-hole on a '76. Use the thick, open-plenum gasket for your '76. The gasket on the left in your photo is correct for your application.
Lars
Hi Lars: What effect would running the 4 hole have? Thanks.
From: At my Bar drinking and wrenching in Lafayette Colorado
Originally Posted by MelWff
Hi Lars: What effect would running the 4 hole have? Thanks.
It's long been known that a dual plane intake benefits from having some crossover between the two planes - this is the reason for the cut-down divider on performance dual plane manifolds, and the cut-down of the divider on the later-model factory dual plane manifolds. Prior to cutting down the divider, the factory did the same thing by simply installing a 1/4" thick open-plenum gasket under the carb to get the crossover effect. This increases power and torque across the rpm range - compare it to an "H" pipe or "X" pipe in the exhaust. The effect of running the 4-hole gasket to eliminate the crossover is simply a loss of power across the rpm range. If you want to limit power a little, the 4-hole is the way to go...
Originally Posted by mijohnst
Lars, I haven't run any gas through it since I've received it from you a while back. It might have had something left over from when you tested it out which is what you're likely referring to. Does this mean that I need to send it back to you or should I just proceed and see what happens?
That's the point: I fuel soaked the carb when I tested it, and you haven't "wetted" it since. If you have had it on the shelf for 2 years since that testing, the carb is not in good shape. You can try it out, but don't be surprised if the accel pump circuit does not function well due to the dried-out accel pump, and the idle circuit may have problems due to dried sediments in the small orifices. If that's the case, it needs to be torn down, cleaned up, and set up again. You can't "store" a carb that has been run.
Carb gasket?
