I’m going to ask a few questions to try to help out. There is no judgement here but asking may help us seasoned veterans get the info we need to give you that “ah ha” moment. And get this engine fixed.
1) how many miles on the 340?
2) have you adjusted valves before with success?
3) can you remove the intake and send us a picture of the top of the lifters.
4) what else do you know about this engine.
Let’s start there. Syleng1
