I know that you may not like my response, but, why did you not drop the pan and look at everything before you bought the motor? With you making runs on the motor it opens some doors for him. How is he to know that you did not over rev the motor or run it with poor oil pressure? I am not saying you did and believe me, I think 100% agree you have the right to be upset. All you can do at this point is hope he is a stand up guy and might help you with replacement parts. Good luck to you.