Chad, you said the stroke was 16.6, does sirio consider this long stroke? just that i am used to seeing 16.8 and abouve being titled as long stroke. are you familiar with the Siim engine, also sirio based with a stroke over 17, are these a 07 version and the EX Teck the 08 with a shorter stroke? I always ran sirio in onroad, they are solid motors, i would like to cary the ex tech but just wanted some version data, email me if you like, i would like to talk more in depth. Thanks Brian