[Kevin 1G Drummer]

I'm using ACL race bearings in my car. They weren't too expensive, and they now have about 25k of not so easy driving on them. You will wanna use assembly lube on them when you put them in, and make sure there is no scoring on your crank. As for a break in period, you'll wanna go pretty easy on the throttle and rpms for about 500 miles, then change the oil. Then change the oil again after 1000 miles, then after that you should be good to give it hell.