424 quits running well after 25 minutes. Update

424 quits running well after 25 minutes. I pulled cover and found one valve with too little clearance. Running good now. Thanks to all for your help.
 
good you found it. valve adjustment sure seams to be a neglected thing. valve and seat wear clearance is decreased. cam lobe wear clearance is increased. or improper adjustment and its all over the place.
 
Glad to hear it worked for you and thanks for posting back.

In my almost 62 years on this earth, your's is the first report I've heard that one valve set a bit too snug will cause a running engine to "die".

I read it on the internet, so it must be true!
 
Bob ,

I did readjust all of them but truthfully only one seemed to need it . I just backed all the others off and readjusted to be sure I did not miss one . Possible that others were off minutely I suppose .
 
guess im not the only one that thought that... I went and reread the post and it says "quits running well" funny how word placement gets different meanings or thinkings. it did not die. lol.
 

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