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I have a 1979 F250 with a swapped in 460. The engine has been in this truck and worked fine for 15+ years. last month is started to backfire thru the exhaust an also the carb when at half throttle or higher only. Idles fine.
I replaced the plugs, roter, cap, wires, "brain box" on the firewall.
Removed the valve cover pan and while running and back firing nothing seems amiss, no leakage past the valve guides, no bent push rods, everything seems to be moving as intended, leaving me to rule out a bad valve, lifter or bent push rod. Although I could be wrong about the lifters or cam area as I did not yet remove the intake.
With true dual exhaust I can tell that it is deffintly only the passenger side that is backfiring.
Any ideas on what to look at next?
I replaced the plugs, roter, cap, wires, "brain box" on the firewall.
Removed the valve cover pan and while running and back firing nothing seems amiss, no leakage past the valve guides, no bent push rods, everything seems to be moving as intended, leaving me to rule out a bad valve, lifter or bent push rod. Although I could be wrong about the lifters or cam area as I did not yet remove the intake.
With true dual exhaust I can tell that it is deffintly only the passenger side that is backfiring.
Any ideas on what to look at next?