Thread: back fireing through the carb

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Cstud, backfiring thur the carb means you have a lean condition. Either install a larger squirter nozzle ( from 25 to a 28, 35 etc) or bigger jets in the front bowl.

If while driving in the crusing mode,.... and say you want to accelerate just a little, ...and if there seems to be a stumble,.... as in the nose of the car dipping slightly before going, you need bigger jets in the front bowl (primary circuit). Go up in size from,... say a 68,.. to a 70 or 72.

When you have that part tuned real good, then replace the secondary jets in the rear float bowl to 6- 8 sizes larger than the front ones. So if you end up with 72s in the front, go to 80s in the rear.

You might also try installing a power valve with a smaller numerical value. So say you have a 65 in the front bowl, change to a 45. This will richen the mixture a little earlier upon acceleration and prevent the back fire condition that you are currently experiencing.

As always, good luck.