Drivers side? Huh??? If you mean the engine block serial number, it is found on all N's on the LH side of engine near below the head and behind the oil filter housing. All 9N, 2N, and early 8N's used the star *symbol in the prefix and suffix of the s/n to designate steel sleeves were used. A moot point now since they don't make steel sleeves anymore. Serial numbers used the letter "I" for numeral "1"; lower case "b" for numeral "6"; inverted lower "b" for numeral "9". After *8N-263843* changes were made, cast iron liners now used, symbol changed to a (<>) diamond prefix and suffix. Parts manuals can decipher when a part was changed. I&T FO-4 Manuals lists serial numbers. ESSENTIAL MANUALS are a huge help - get your copies if'N ya wanna be an N-Owner.
FORD ENGINE BLOCK SERIAL NUMBER IDENTIFICATION:
***NOTE SERVICE BULLETIN Date. Serial number identification was used on all Ford vehicles and long before the N-Tractor came along.
FORD N-SERIES TRACTOR SERIAL NUMBER LOCATION:
FORD 8N TRACTOR ESSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS: