Actually, redline is correct about the briggs single vs the tec single being identical. the twin however, is rotated 90 degrees when you look at the mounting pattern in the sump vs the "front" of the motor. I think you would have your crank in a slightly different spot. Please correct me if I am wrong here. I just remember trying to fit a tec twin on a jd 111 and remember that the mounting holes are in fact different. I would have had to re-drill 3 of the four holes for mounting in the motor plate to accomodate the twin.....