Frank - I've seen 22's? with the low deadrise (like 12 degrees) and I think the 1980's and early 90's 25's are a different hull like you described. The 1970's 25's I've seen are a dead ringer rip from the formula . . . waterline down.
Here's a 1977 mako 251
http://www.classicmako.com/forum/top...TOPIC_ID=56396
