as in almost every North american engines , you do not re-gap spark-plugs , you just change them during those checks..Or is it differently on the B17
Well, some one better tell the FAA
FAR 43, Appendix A, (c), (20) states "Replacing or cleaning spark plugs and setting of spark plug gap clearance" as part of preventative maintenance. The famed Len Morgan of Braniff, besides his aviation publishing business, ran a side line in cleaning and gapping his airlines plugs back in the day.
https://www.ecfr.gov/cgi-bin/text-id...117.a&rgn=div9