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Message: <blockquote data-quote="noglass170" data-source="post: 463039" data-attributes="member: 24442"><p>Thanks for the fast replies. I think I will go ahead and pick it up.  externally the powerheads are exacly the same. The two even have the same bore. The 25 uses different pistons, head, and carb. I think OMC used that same 22.1 cubic inch block for the 18, 20, 25, and maybe even 30hp. I'm not exactly sure on the 30, but the other three I'm sure of.  Worse comes to worse I'll just have to find a early 70's 25 Johnson to put the powerhead on.  :lol:  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin    :D" loading="lazy" data-shortname=":D" />   I'll update this thread with my progress. Love these old TANKS of an outboard!</p></blockquote><p></p>