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I have a 308 with Holley 600 vac sec and performer manifold in an old HQ. When i floor the car, no matter in what gear, a cloud of what i think is unburnt fuel is let loose. It used to ping when this happened, but since i put some carby cleaner down the carby, this pinging has completely stopped, but the clouds are still coming out.
Does this mean that the carby is running too rich, the sparks need replacing, or timing adjusting? Anyone have any ideas.
Cheers in advance guys and girls!
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Rank: Guest
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Yep black smoke is a overly rich carb. Since its happening when you floor the car its probabley the power valve.
Thing i hate with holleys is that its not as easy to tune as a quadrajet, to lean the power valve curcuit you need to do things like solder
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Rank: Guest
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Just one more thought, if its just a momentary puff of black smoke when you floor it it could also be that
the accelerator pump outlet is too large and you may need a smaller one. You could try that first as it would eb a cheap and quick option.
You wi
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