618 w/175 merc and standard Jack plate. How long?

I have 21 feet 10 inches of room straight back. Thanks Tony. http://www.bassboatcentral.com/boardstuff2/beers.gif

Boat - 18'6" (with swing-away trailer tongue)
Jackplate - 8"
Engine 2'

Total: 21'2"

Go for it!! http://www.bassboatcentral.com/smileys/thumbsup2.gif

Kenneth