1331-111-13, 48-855858A46 Engines Application:3.25" Gearcase25hp Bigfoot(4stroke)1999-200530hp Bigfoot(4 stroke)2010-30hp(2&4 stroke)1994-200530hp(SeaPro/Marathon)...1994-newer35hp...1984-1989402&500 Models...1974-198440hp(2&4 stroke/not bigfoot)...1977-newer40hp(Sea Pro/Marathon)...1977-newer45hp...1986-198948hp(Mariner)...all years50hp(2&4 stroke/not bigfoot)...1977-newer55hp(Mercury/Sea Pro/Marathon)...1995-newer60hp(4 stroke)(not bigfoot or Sea Pro/Marathon)...1978-newer60hp(2 stroke)...1978-70hp(Model 700)...1983Force40/50hp...1995-199870hp...1991-199575hp...1996-1998