1971 Donzi Classic 18 power....

[FUJIMO]

You are up way too early Xstream. Yes, big difference in motors. To build a durable marine 450 yourself, you will have comparable dollars into the build(or more) that a marine engine supplier has already tested & warrantied. A turnkey engine is bolted in and running, in a couple hours. All of this is value. Value in the ease & quality of the engine install, but also to the entire boats final value. Imagine NEVER having to wrench & repair your new engine, just enjoy it, EVERY TIME you hit the key?! Priceless.