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Old 08-11-2010, 03:52 PM
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still rich?

got my carb rebuilt at high performance shop and it still it smokes black smoke heavily..he says quadrajet may be too big. 1977 Chevrolet 350

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Old 08-11-2010, 04:06 PM
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You might want to take it to a different shop that knows about carburetors.
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Old 08-11-2010, 05:21 PM
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could it be high gas pressure?
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Old 08-11-2010, 05:33 PM
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Find someone else to work on your carb.
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Old 08-11-2010, 08:03 PM
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Quote:
Originally Posted by whojohnjones
got my carb rebuilt at high performance shop and it still it smokes black smoke heavily..he says quadrajet may be too big. 1977 Chevrolet 350
I'll second and third the need to take it to a different shop. The Q-jet is a good match for almost anything. But a strange carb mounted to a strange engine will have to be adjusted which can be a big effort. Putting a Q jet from a 455 Olds onto a 350 Chevy will take considerable tinkering with jet and metering rod sizes. If there is much of a difference in the cams of the two afore mentioned examples you will also have to deal with the springs used to counterbalance the manifold vacuum through-out the RPM and throttle position range from idle to WOT in order to get the metering events correct for the engine's air flow. Plus you will have to adjust the secondary metering air valve for tip in timing and rate which can be other springs, counterweights or both depending upon model. This isn't trivial pursuit, it can be pretty complicated to do, help is at hand get one or both of these books then study up to get ahead of the curve on knowing these things;
http://www.amazon.com/Rebuild-Modify.../dp/1932494189 or http://www.amazon.com/Rochester-Carb...d_bxgy_b_img_b.

Bogie
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Old 08-11-2010, 09:51 PM
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when he called sayin he was finished I checked it out and didn't pay for the carb rebuild and he said he could tune it more
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Old 01-14-2011, 01:05 AM
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I found the problem but forgot to report back. the problem was gas tank pressure is too high. fixed it with fuel pressure regulator
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