Plus depending on the heads you want to use, you'll need to need to have the coolant passages drilled. I'm using magnum heads and drilled 10 holes each side, but you can do it or have the shop do it. And if you go with standard bearings a oiling passage will need to be drilled in the rear journal as stated on the website as well. Roller bearing it's not needed due to the drain back and splash will be enough as Mike at QMP told me.