What did this to these plugs in 20 minutes? You won’t believe it!
Bought this car, SBC, brand new Dart Pro1 Heads, assumed fouling was from bad carb or maybe too aggressive of an electric fuel pump, engine has maybe 15 hours total run time, can foul plugs in 20 minutes sometimes.
Put on a known good carb, same thing, checked fuel pressure, less than 4 psi, runs like garbage until it gets to higher RPM, great on the highway, a toilet puttering around otherwise.
Would love to hear your thoughts