I posted on 2nd gen but no answers . I have a chance to get a 24v head but i need the casting numbers told they are in the intake . i have searched and found 01 and 02 are the best i think . i dont want to tear mine down to get theses # if some one has an 01 or 02 head off and could get me the # that would be great or the # on the head u think is best and multiple # would be great if the good heads have more than option on castings . Thanks alot