Agree with Tab to double check your timing. Also, is your vacuum advance
working?
>
> I've been patiently trying to get a 1969 MGB to run for about
> a month. So
> far, I have cleaned and sealed the gas tank, installed all
> new fuel hoses,
> filter, tune-up, and I switched the Weber which came with the car for
> original SU dual carbs. I have the same symptoms as before -
> BACKFIRE -
> through the exhaust and carbs. The car idles fine, but as
> soon as I rev, it
> backfires like crazy - the mothers grab their youngns for
> fear of a drive-by
> shooting (automatic weapons fire). Any clues? Thanks.
>
> Rich Townsend
> Manassas, VA
> 69 MGB
> 75 TR6
>
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