what will happen if i take 800 xc connecting rods and use them with a 700 top end? the stroke on the 700 is 68mm,the 800 70mm. i know it will increase compression and lessen clearences to the head.but can it be done and will i have to change anything else? i bought a used lower end and was told it was a 700 ends up its a 800! WTF!..