Mike any GOOD engine builder will tell you that you never put new heads and pistons on an old bottom end Those raptor have a crazy amount of Torque Remember alot of car engines builder are lost with the smaller motors I would get a 2nd opinon !! I learned the hard way !!! An 8 year old botton end is askin for trouble !!!JMO
Mike I built my first motor when I was 16 I would NEVER not do the bottom end All you doing is spliting the cases and dropping in new seals and bearing !! About 40 $ in parts !!! well worth the trouble !!! that crank and rod are way more costly