How often do we need to change the timing chain. 2000 Blazer LT 4.3L 4X4 75500 miles

 

When it breaks... The 4.3L is not an interference fit engine so a timing chain failure will not result in additional damage. Honestly, I wouldn't worry about it until well over twice the mileage you are currently showing if you did want to replace it as preventative maintenance.

Now if you had stiffer valve springs installed and/or higher ratio rocker arms installed, then this would create more stress on the chain and result in faster degredation, but the factory change setup is pretty strong.

 

thanks for the info kyle, like always you seem to know the answer to my question lol.

 

The best part.


He is usually right too.

 

Usually? LOL. Thanks Tim!

 

If and when you do change this out, I would go with the DBL not the single. I upgraded this in my 350 when I rebuilt it and its still within .002 of new and 115,000 miles on it. (checked it when I replaced the timing cover gasket due to I changed out the cover).

On any car/truck/suv I get that has over 140,000 I change out the timing chain/belt just for peace of mind.