You should be good to go with the 55 shot, wouldn't go any higher than that though to be on the safe side. You don't HAVE to build your internals at all if you keep the shot low enough. Over a year on a 125hp shot on STOCK internals and when we pulled the rods and such for the rebuild, there wasn't much extra wear there at all. Now, that big of a shot on stock cluches...that's a different story all together, hehe
