Long story short.
Start truck cold, getting clicking noise...sounds like valve but runs great. Warms up and clicking goes away. Remove #1 spark plug and it shows build up of whiteish carbon. Will remove the other spark plugs and check. Also starting to use half a can of oil a week. No leaks that I can see. Oil pressure gage shows high...always has. Also, open door and get out after driving and smell oil. Wanted to make it to 400k but might not be able to with this issue.
Going to do a compression check to see what else is happening.
Still have decent power.
If cylinder pressure is good would it make since to do just a "top end" rebuild (if it is a valve issue?
Should i pull it and do a complete rebuild?
What does white build up on spark plug usally indicate?
Original owner
thanks

 

The oil gauge sending unit is just a switch,that's why it will always go to the same spot on the gauge.
Put a real mechanical gauge on it
to check the oil pressure.If you haven't all ready done so.
And go from there.

 

your most likely getting some blowby should be expected at that mileage...i would not waste your money on doing a top end rebuild with 375k on the bottom end. like above get the real oil pressure you might be able to get by with a oil pump if pressure is above 10 spi at idle