MerCruiser Exhaust Pipe Y-Tube Shutter Flappers 14348A1 807166A3 Pair V6 V8 Used 3hp but pretty much any 3M

but pretty much any 3M sticky foam product should work for this

225-2494A30

5L & 140 3

It's probably in your best interest to just see what number is physically stamped on your steering shaft & go from there

Item Details For use with Stringer 400 (120hp / 140hp 4cyl) outdrives 1982-1985 - Fully Mechanical Shift

MerCruiser Exhaust Pipe Y-Tube Shutter Flappers 14348A1 807166A3 Pair V6 V8 Used 3hp but pretty much any 3MItem Details Generally Found on MerCruiser V6 & V8 (4. 3L V6, 5. 0L 305, 5. 7L 350) Alpha One & Bravo applications 1985 Present on applications that used this style of flapper. Some systems has the one that pins through the tube rather than this one that falls into place on the top of the y tube, so make sure you are ordering the right type. Exhaust flapper pair here is used, but are in good shape yet, so that is why I am selling them MerCruiser P N