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Re: Backfiring.
I am just surmising here but for it to back fire doesn't there have to be unburnt fuel going down the exhaust? I remember this used to be much more common in the old days especially when seeing trucks coasting down hills. I think burnt exhaust valves on engines long overdue for an overhaul might also cause this.
That said, my 232 Rambler and 250 Chev C10 both do it. It is not that noticeable because the mufflers are good but I am still aware of it. Maybe the carbs are letting some fuel through.
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