engine backfire when slowing down

bonanza7369 said:
I have a 56 with 292 engine 4 barrel tea pot carb. the carb was rebuilt last year. I am getting some backfiring thru the exhaust when engine braking.
The car has glasspack mufflers.
Could this be caused by a to rich fuel mixture or possibly timing problem.
Engine runs smooth and accelerates well. It also is hard to start after it sits for a couple days(takes a lot of pumping of the gas pedal)
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I'm having the same problem with a 351w with 2X4s in a 40 ford.I have rebuilt both edelbrock carbs,changed plug wires,and checked for exhaust leaks.
 
Another source for ignition is Bubbas in Indianapolis . He is great to deal with and Knows his stuff. check on the flathead v-8 side of the Fordbarn.
 
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