Are you aware where by I can see pictures of an economy k20 crank vs a general performance k20 crank so I'm able to know very well what it finally ends up getting?k20a2/ k20a3 blocks Is there any big dif. concerning both of these. I'm chatting just the blocks. As in would a K20a2 block certainly be a more sensible choice in sleeving about the A3? T