> Motor bike and car engines were traditionally set just below the taxation > limit so that they could be rebored and remain within the limit It also became the measure for racing categories, so with an extra 5cc (or = whatever) available it could be blueprinted without exceeding the category = engine size. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .