And how much does the cowl weigh?
Lot's of people make 1st flights with the cowl off, never once considering what the removal of 2-3 ounces does to the CG.

And many do it because they have no clue how the new engine will run which suggests why lot's of them wind up deadsticking. Better to take a bit of time to get the engine running reliably. It's really good to have a reliable low end and an idle rpm you can trust that's slow enough and sure enough to give you a reasonable speed on final.