Andrew wrote:
>
> Hi all,
>
> I have a 350 SBC with a Holley 600. The motor is in a car that has been
> stored for 12 years, and the previous owner had turned it over
> regularly using 2 stroke gas. The car ran really rough and it was
> suggested that I remove the front of the carb and clean the primary
> jets etc. I did this, and removed as much of the old gasket as I could
> and replaed with new. Now when I try to start the car, it won't,
> backfiring badly. What have I done wrong, or where should I be looking?
> I don't think the float level was touched, but it may have been knocked
> during ceaning - would this cause it? I have a rebuild kit on order,
> but it may be a few weeks away (I am in New Zealand), but have a gasket
> set bought locally. Any thoughts?
>


Well, I can tell you that Holley carbs of that era tend to
be very intolerant of backfires. There's a part of the
carb called a "power valve" which takes care of enrichment
after the accelerator pump shot is consumed. The rubber
diaphragm in that valve tends to be easily damaged by as
few as one or two backfires out the carb throat.

Best bet is to throw an overhaul kit into it.

JazzMan
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