Ayars, are you referring to the 420 blower from a HP 600 motor?

http://southjersey.craigslist.org/boa/4362418405.html

Not sure if this is what your looking for but he started at 4500, so maybe he still has room to flex.

That's a 177/174 blower setup and worth less than $1500. He is way over priced.

Not sure what the deal is with used blower prices. For what people want for used ones it doesn't make sense to not buy new for $1500 more.

imo, go with a bigger blower, more power, less heat and if you are not running the heck out of the boat to get into the boost them you will also do a little better on fuel. something to think about. some of the older blowers are getting harder to find parts for as well.

I've seen used 250 setups with carbs sell from 1500-2500 in the last two months. I look at it like this, a 6-71 new is $2800 plus carbs and flame arrestors so when it's all said and done I'll be in it for at least ~$4000. My goal is to spend half that.