[THEFERMANATOR]

Originally Posted by spareparts

I'm not the Johnrude expert, but i believe the 150/175 are the same block, and the 200/225 are the same, so i don't think you can upgrade a 175 to a 200, but you can upgrade a 150 to a 175, and a 200 to a 225. Ferm or Skools will be along with the correct info if I'm mistaken

What he said(for the most part). It gets real tricky though with the 200/225's and then you throw in the rare V-6 250 and it gets head spinning. You also have to be careful not to get the 120/130/140's confused with the V-6 carbs as there are some of teh V-4 carbs that are an 1/8" smaller in the venturi than the V-6 carbs yet have the same base plates and bore above and below the venturi.