[jdpalmer]

I had one lock after 11 mile on rebuilt engine with inserts. the rear main locked because the oil grove did not feed the bearing properly . don't turn a Locke motor until you check the bearings on the crank. one other thing that will lock the motor unbelievably but the little screw on the side that holds the oil pump while installing from bottom will get tight and lock the engine as I have had this too. Best of luck but if you just had this done you better take it back before you void the warranty by doing more damage.