Well. today i put blue tack (haha didnt have any plasticene) on my pistons to see what would happen and i guessed it.. the dome on the 3T pistons are waaaaay to big (in width) accross the top of the piston. Me thinks i have a different head (newer version of the yamaha head) because the doem on my old 2TG pistons is offset and ALOT smaller... I just hope there is the same about of meat on the 3T pistons as my 2TG coz i'm gonna get an engineering mod to do all of this work (not gonna cost heaps tho) anyways more info would be very much appreciated..