[quote=&quot;Jason Epperson&quot;:me8do335]I was wondering if anybody could tell me what the differences are in a #181 and  #374 M. S. carburetor?  I have an old style 88 with 3 and 3/4 pistons in it and want to know which one will work the best.[/quote:me8do335]

Having suddenly developed a keen interest in 88 carbs (see 77/88 carbs post if that doesn't make sense), I can say that the TSX 374 is listed in the IT manual as the "correct" MS carb for 88s, with the TSX 610 listed as the right carb for 88s after SN 6503000.  Only other carb listed is the Zenith 11580 used on some 88s before SN 6502000.  Can't say what the TSX 181 was used on.

Hope that helps some.

Ed