1976 dodge 3/4 ton 360
I was coming down a hill let off the throttle
and it backfired and blew the header gasket.
I replaced the gaskets but now it Boggs Dow
during idle and driving
Could have damaged the internals of tha carb, if it backfired that bad it meant the carb needs work anyway, could have also maybe even ruptured the advance diaphragm on the distributor.