I was talking to a mechanic at the dealer about installing the 103 cu. in stage III kit on my 09 FLHX verses boring my original cylinders and buying after market cams, push rods valve springs etc. He told me...... get this. He said that the block on the touring models is different than the FX models and that the touring model blocks won't hold up to the stage III as well as the FX blocks will. He said that Harley uses an A and B block on these two models? Has anyone else heard of this?