The machine shop just finished rebuilding my BJ8 engine. It should be back in the car in another week. As far as break in procedure goes, the machine shop recommends using 30 wt oil for break in. Try to vary the rpms up and down constantly for the first 500 miles, and don't rev it real high. After 500 miles change the oil, retorqued the head and readjust the valves. Use 30 wt again for another 1000-1500 miles and then switch to 20-50 wt. Experts, do you agree with that? Should I do anything else? Thanks.