Re: Backfiring
Well, now we know what kind of carb. I have no first hand experience with Marvel carbs, but, my advice would be to play with the choke rod adjustment ............. open or close a bit to see if things change. Assuming the carb is in good condition, this might tell you it’s just a matter of finding the sweet spot where it runs best.
Of course, there have been many other good suggestions made here and all of them are viable. Take heed .......... but remember before you start modifying (having the manifolds planed, etc) try CALMLY going through each suggestion to see if things change before you move on to the next suggestion. The Process of Elimination is always your best friend. Make a list and go through the possibilities “one by one” before you make any bold moves to try and cure 10 things at once.
Good luck.
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