I just purchased a 25' warlock sxt cat. Was wondering how to check the X- dimension, don't know much about it but really want to learn it. can someone give me a schooling ??

Here is a tread on the subject:
http://www.offshoreonly.com/forums/g...per-lingo.html

On Bravo 1 (if I remember correctly) the crankshaft centerline to propshaft is 21 13/16". Meassure where your propshaft is in relation to the lowest point of the bottom and subtract that number from 21 13/16" and you will have your X.

In 91 those boats had a pretty low x. If it is a standard bravo try a 2in shorty worked wonders on mine. And hopefully you have hyd steering.