I have recently purchased an 83 k10 with a 400 bored to a 406. I am getting a lifter noise from passenger side of pistons. I have already screwed with the rockers and that's not it. So I a, assuming I need to do a lifter job since I have read that is not good to replace just one. I don't know too much about what parts this truck may have internally. The rockers are erson 1.50. I am trying to figure out what specific lifters I need to get. I don't know if I need to get a certain kind. Any help would be great.