I just read all of the great info on the Evolution engine...and maybe you can help me...I have a new one in the box and there is no size written anywhere that I can find....It does have the Alpha "a" on the top side of the engine and I have been told that is the alpha model which is a .45 something....I guessing that the earlier models were called alpha's if they were the larger of the two sizes available at that time( I understand that there was also a .40 something )... Is that correct and what size is mine? Thanks for your help...Richard