SELECT MAX(year) FROM table_name_82 WHERE engine = "offenhauser l4" AND chassis = "kurtis kraft 500c" AND entrant = "federal engineering"
Mana tahun terakhir yang memiliki mesin Offenhauser L4, sasis Kurtis Kraft 500C, dan pendatang Teknik Federal?
CREATE TABLE table_name_82 (year INTEGER, entrant VARCHAR, engine VARCHAR, chassis VARCHAR)