You are correct.....55 seat, large throat....in the area of 95-96%.....not concentric so that is an estimate....and I never claimed to be a head porter....just a hobby....and u take no offense to any of the debate on here....I am not a big proponent of big low lift numbers anyway...but if I was inflating my numbers on purpose you could bet they would be higher...I know very little compared to some of the best out there I just like to say....why not....and give it a try...I won't patronize you by wishing you luck on your endeavor......wink