Not a stock intake, alluminum after market, No vacum advance on distributor, linkages seem ok, but will need to check for leaks around the intake/ carb .Why would it backfire only on one side of the engine if it was a carb issue and not backfire on both sides all the time or randomly? All...

Holly double pump, not sure of the number will have to check for tags as I did not install it. Huge carb and new fuel filter this year so can prolly rule out starvation for fuel. The back firing only on the passenger side baffles me. Thats why I was leaning towards a stuck lifter, bent push rod...

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...