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Old 05-03-2013, 07:26 PM
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Need help with finding the right Carb!

Hey guys, I have a 1968 chevy with a 76 small block 400 board 20 over. I am running a Engine Pro CamShaft Valve Lift is Int.488 Exh. 509 with a .050 duration. As of right now I have Edelbrock 750. with an edelbrok intake. I am having problems with keeping my engine running when I put it in Drive. My RPMs are set at 1200 idle, but when I put it into drive it drops down past 300rms if not lower, and bogs down and dies. Should I drop my carb size any? Or does anyone have any other suggestions to try?

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Old 05-03-2013, 07:34 PM
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carb size is fine.
what is your static timing set at,,
Is this a new carb,,,,
Is the engine new,,, and anything else to work with?
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Old 05-03-2013, 07:45 PM
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Im not for sure what you mean on static timing, I set it TDC. Carb is old, just rebuilt motor and trying to get it running, its flooding out real bad! What other information would you need to help me.
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Old 05-03-2013, 07:50 PM
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I just pulled out the number 2 spark plug and it is completely soaked!
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Old 05-03-2013, 08:05 PM
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when you set the timing with the vacuum hose disconnected,how many šs did you advance the timing from zero?Was the carb working before? Do you have a quality ignition system? Is the camshaft long duration? Are you using headers?
NOTE: you may need new plugs
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Old 05-03-2013, 08:19 PM
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Need help with finding the right Carb!
maybe combine both threads?
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Old 05-03-2013, 09:34 PM
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Low manifold vac. at idle from duration of cam. Improper carb setup. The throttle plates are open too far for idle circuit function.
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Old 05-03-2013, 09:56 PM
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Quote:
Originally Posted by vinniekq2 View Post
Need help with finding the right Carb!
maybe combine both threads?
Done.

Lowred, please don't double post, it won't get you a faster response.
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Old 05-03-2013, 10:29 PM
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No offense but it sounds like you know just enough to really screw things up. I would either find a good mechanic that will fix your mess, or drop in a stock 350 that is in good running condition.

If you do want to fix this yourself I'm guessing it will take a greenhorn like you the better part of a week and you may spend a grand by the time your done.

Best of luck, if you're still wanting to learn what to do google is your friend but just learning what to do can take a person a while. A mechanic may get it fixed for less than a grand out the door. But it soy rs like your ignition is way off, fuel pressure may be out of line, prob needs a higher stall with that cam, and only God knows what else.
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