On starting the motor for the first time this spring I have #1&4 not firing. Screwdriver test I have good spark at all plug terminals. I’ve changed plugs, checked compression, pulled valve cover and all valves are moving the same. It’s not spitting back or backfiring. I’m running a Prus head, high lift cam, Winfield carb and a distributor. Any ideas?
Plug wires swapped on those two cylinders.
I will check that out in the morning. Thanks.