What about the 25" Motor ?

[cadeco]

I have read many posts from people tha had brackets installed on the Seacrafts, many times they say that they had to raise the motors (they were using 25" motors) in order to run perfect. Why can't a 20" motor be used instead of the 25" to solve this issue, one aspect of it would be cost since looks to me that 20" are cheaper then their 25" counterparts. Can someone clarify it to mew? Thanks