gettingbackintoit

i will get some pics as soon as i work out how lol, please bear with me

hi og just joined up tonight, over the years ive had 125dx,200dx,400dx,350lc anyway ive just got hold of apair of dt engines to build a fast little project for my son, first question lol whats the differance between a y-1 head and a y-3 head of which i have both, ive read lots of posts but not came across the later any help would be greatly app kind regards nick