I am hearing lots of motor issues lately. My friend Mike just had a 400 built, we picked it up and installed it this past week. He has a VERY loud lifter tick, can not adjust it out. Personally, with modern day oils, I would not build an engine without it being a complete roller motor. I am hoping my newly built 400 will go well as it is now a complete roller motor with a brand new rotating assembly. I wish you the best of luck with your issue...