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JRP - Someone at Whaler gave you the wrong information on the classic Outrage 18. Even in the eighties, almost all 150's weighed more than 400#, and Whaler often showed the boat with twin 70's, or a 150 single and a kicker. These combinations could weigh as much as 550#.

I have twin Merc 90's on mine (305# each), installed on 10" setback jackplates and a battery in each stern corner, and no problems, no stress cracks at all. Here is a photo with my son (150#) adding weight to the stern, plus a loaded Igloo cooler also:

http://smg.photobucket.com/user/lgolt...=6&o=8

Since your Outrage II weighs 600# more than the original, maybe on yours a 150HP 4-stroke at around #450# would be the max? Just don't know on that one.