I just bought a 03 RKC with 7,000 miles on it. I see in JP cycles and a few other places they sell a kit that that makes a 103 cu in. Has anybody used one of these kits? They are fairly cheap. I think the kit is around $850 Thanks in advance.

 

you have an 88 inch there, so that kit will only get you 95".

 

Not totally familiar with the kit mentioned, but there is a stoker crank for the first generation of twin cams that will bring it to 103 cubic inches.
Is it cost effective I dont know, it only becomes a matter of money the first time you do a mod. to your engine.
Rob.