Maybe I am overthinking but I have a large plenum, ported head but the runners, aprox 4 inchs long, are untouched. Should I open them up or leave them stock?
2 reasons, in my mind, to leave them stock-keep up some port velocity to make it more driveable and help reduce lag so to speak.
Or will porting it make the whole package better and stop overthinking, this isn't an N/A engine.