I know this beating a dead horse, but can I fit a 2" riser block on a 2002 Summit highmark (non X) without any modifications or cable extensions etc.???
As far as i know, yes. I have quite a bit more than 2 inches in my 02, which required extensions, but i know a guy with the same sled who has put at least 2" in with no extensions, so you shold not have any problem. Just check all of your lines first, estimate how much slack you have.
2" should be a piece of cake. I put a 3" on my 01 summit and needed to installa longer brake line and looks like I may have to adjust my throttle cable as my idle is up around 3K