I just need someone in the know to confirm what I’m doing before I go ahead and fit the main bearings. when I disassembled the main bearings, all the upper bearings were grooved and the lower bearings were plain. The image below was taken after the crank was lifted out. The missing beating came out with the crank.   However reading the Haynes manual it describes the plain and grooved bearings being placed in different positions (upper and lower). Do I just ignore the Haynes manual and place the grooved bearings all in the upper position?