CNC Mill Mark Removal in Intake Port

Earlie A said
Do these overly rich conditions show up on the dyno O2 sensors?

Yeah, you can watch it in real time. You can see the puddle get used up and then how long it takes to get the puddle established again.

The biggest tell is when the plugs look lean and the O2 and exhaust ports look pig fat rich.

You know you are just blowing fuel right through the engine.

Edit: this is why your wife NEEDS a dyno. Just sayin’…