Recommended 4bbl carb for stock 318
Backfire through the carb is ignition before the valve is fully seated. Makes sense. Right? Easy to remember if you think about it.
Just noticed in the mockup the transmission's 'kickdown' is all the way back. In actual use, make sure its forward so throttle opning increases pressure in the transmission throttle circuit.
Experience is a good teacher. You'll get there!
Haven't bothered to adjust the kickdown since I'm still trying to dial in the carb, sorry sould have mentioned that.
Most likely timing or something of that nature, but...
According to Holley and the troubleshooting section for backfires, there is more than valvetrain issues that can cause backfires.
It could be anything from faulty egr valve, ignition coil, plugs, plug wires, ignition timing, valve timing, vacuum leaks, also worn or damaged valve train parts, even choke. Most common being the timing.
This happened before the car even had a chance to warm up for the first time
For myself it seemed to be overly lean, which may have been caused by only having 10v to the choke and it was to the max on lean which I didn't notice.
