Carb rebuild or replace
Thread Starter
Instructor
Joined: Mar 2019
Posts: 113
Likes: 25
Carb rebuild or replace
Hi all. I have a 1972 SB which has been rebuilt to 1970 specs, 350hp. It currently has a holley 3310-2 carb but has developed a whistle once warmed up and also leaking fuel onto manifold (think it's coming from accelerator pump diaphragm. Since it's not the original carb (?) I was thinking just putting a new carb on to hopefully fix both issues at once OR should I just get current Holley rebuilt? If I replace, what carb would people suggest? Thanks. Doug
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
If something is "broken", it should be fixed....especially if it is causing raw fuel to be dumped into the intake system.
HOW you fix it is your call. A good rebuild of a carb is probably as good (or better) than replacing it with a modern 'parts store' carb.
HOW you fix it is your call. A good rebuild of a carb is probably as good (or better) than replacing it with a modern 'parts store' carb.
Le Mans Master
Joined: Mar 2004
Posts: 7,493
Likes: 1,502
From: Little Rock AR
Just fix the leak on the carrb.
The whistle would make me investigate heat as a cause. I have had that problem in the past and blocking the heat riser passage and eliminating the heat riser valve seemed to help. I might not do that if you still run an iron intake manifold. Those take a long time to heat up.
The whistle would make me investigate heat as a cause. I have had that problem in the past and blocking the heat riser passage and eliminating the heat riser valve seemed to help. I might not do that if you still run an iron intake manifold. Those take a long time to heat up.
Melting Slicks
Joined: May 2002
Posts: 2,476
Likes: 756
From: Laporte, IN
Check Rock Auto for a rebuilt carb.
https://www.rockauto.com/en/catalog/chevrolet,1972,corvette,5.7l+350cid+v8,1 040959,fuel+&+air,carburetor,5904
Or Holley to replace
https://www.holley.com/products/fuel.../parts/0-3310C
https://www.rockauto.com/en/catalog/chevrolet,1972,corvette,5.7l+350cid+v8,1 040959,fuel+&+air,carburetor,5904
Or Holley to replace
https://www.holley.com/products/fuel.../parts/0-3310C
Last edited by PJO; Oct 19, 2019 at 10:56 AM.
Racer
Joined: Jan 2008
Posts: 295
Likes: 58
From: Arvada Colorado
Rebuild the carb. Current fuel will attack some of your components. Holley makes a viton accelerator pump diaphragm which is resistant to the modern fuel. Use the blue bowl gaskets. Try this first. Also replace the secondary diaphragm ( don't loose the check ball ) . The cork gaskets in the idle screws are probably shot too. Check the throttle plate for flatness. Replace any vacuum port caps ( if you have any ).
Last edited by gg521; Oct 19, 2019 at 12:05 PM.
