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The wife named it The Purp-etrator!

Ok gents here's an update: bad spark plug! Even though they are new, been in just a month or so it just kept running worse and worse. Started pulling plugs and behold! Wet plug on #3. Changed it out, set the timing to 12* initial and Woo Hoo! Runs better than ever. Any recommendations for...

I checked the timing chain when this all started and there is no slack in it. The distributor and ignition box are new, just installed it yesterday. The thing that bugs me is that it used to run great, makes me wonder too about a weak or broken valve spring or some other issue with an intake...

It will backfire at higher rpm when moving or just winging the carb. Didn't used to do it, in fact it ran great. If I bring up the rpm's slowly it's fine, but try and spin it up quick and it pops. The only thing I changed before this started was new plugs and changed out the Thrush glass...

I have a 383 in a '71 Duster and I can't seem to figure out why it sometimes backfires through the carb during hard acceleration. The motor was in the car when I bought it so I don't much about the internals other than it had a "soft rebuild" so I'm assuming it's pretty much stock and was just...