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#1 |
Blue 67
![]() Join Date: Apr 2004
Location: Western WA
Posts: 1,178
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Do I need to rebuild the my carb?
Hello:
I have an edlebrock 1406 (electric choke) which is runing very rich. I was told before on this board that I have to change the main jets. Now, it has been a while that carb spits at the first gear when truck wants to take off, also it back fires. I am at 12-15 degree advance. I don't think my engine (a 350 out of what I don't know!) is anything special,my truck just came with it. I also change my point type distributor to mallory HEI few weeks ago if that mean anything. Thanks.
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1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
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#2 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,482
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Re: Do I need to rebuild the my carb?
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I don't know a lot about carbs or what kind of adjustments the Edelbrock has so I can't help there but it seems to me that 12-15º advance is a little steep for a stock 350ci small block. I would think 8-10º would be a better number and make sure it is set with the vacuum advance hose off and plugged. Did you re-gap your plugs when you put the HEI in? LockDoc .
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - Last edited by LockDoc; 12-19-2008 at 10:07 PM. |
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#3 |
Blue 67
![]() Join Date: Apr 2004
Location: Western WA
Posts: 1,178
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Re: Do I need to rebuild my carb?
Why the carb pups though? Is it just because the advance issue or it could be accelator pump assembly in the carb.
__________________
1953 GMC 3/4 ton: current project 1967 C20: 5.3 voretc with T5 conversion, 4 wheel 8 lug disc brake 1972 Nova: my 4 door sport sedan! 5.3 voretc + T5 conversion. drivable project, FUN!! 1979 Camaro Z28: 5.3 vortec conversion with build TH350: drivable project, Fun to drive 1992 Camaro RS convertible (Z28 clone): 5.3 conversion with build T5: on going project 2005 Silverado 2500, 4x4 Duramax, original owner |
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#4 |
Registered User
Join Date: Oct 2007
Location: Rutherfordton, NC
Posts: 89
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Re: Do I need to rebuild the my carb?
Have you "played" with your timing any? Adjust, drive, adjust, drive...? Vac. advance?
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#5 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: Do I need to rebuild the my carb?
A quick check of the accel. pump. With the engine off look down the throat of the carb & move the throttle from the idle position. There should be 2 squirts of gas go in the throats. If not or it just dribbles, the accel. pump is bad. Take out a spark plug or 2 after being driven. If there is black carbon on the porcelan it is probably running rich. With the engine idling slowly turn the idle jets, one at a time, in till the engine starts to slow down. Then back it out about 1/2 turn till it runs the smoothest.
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