if that is infact true then they will fit. Compression height is the distance from the centerline of the wrist pin to the top of the timing edge of the piston. The timing edge is the height the piston would be if it was a flat top (basically think of it as the height the piston would be if you put it on a belt sander and removed the dome to a level surface). Dome height is another thing and needs to be accounted for by clay checking the motor. Remember to do the clay test with a spark plug in to make sure there is ample spark plug to piston clearance. The actual distances that are safe to run depends on builder preferance. hth.