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Eratic behavior from an 85' 6.2 (more below) requesting help please (Two vids in one)

The marks should line up when there is a new timing chain. As the chain stretches the timing is supposed to get adjusted. Gm called for 50,000 mile intervals but all the fleets and shops learned 30,000 is a more realistic interval. Doesn’t usually take much, width of a dime each time is fairly close for most. Using the timing gun is the proper way.
 
The marks should line up when there is a new timing chain. As the chain stretches the timing is supposed to get adjusted. Gm called for 50,000 mile intervals but all the fleets and shops learned 30,000 is a more realistic interval. Doesn’t usually take much, width of a dime each time is fairly close for most. Using the timing gun is the proper way.
Oh copy. I have not idea if my chain was ever adjusted or not, but I was told that going off that mark indicator was the way to go, and that since the two notches line up, it should all be good
 
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