i remember reading (not sure where) that head work on an "unbored" raptor was a waste because the factory bore size was too small to take advantage of the work. IS THIS TRUE?
also does any one know if say...trinity did head work for my raptor now and then i got their 727 kit later would they use that same head work or do some more or would i have to get a new head....my head hurts now.haha. i would'nt think one head work fits all. i'm not a mechanic so you'll have to forgive these questions.

 

Any head work will help but you won't get as large of a percentage of gain as if you had the 102mm bore.