I thought my issue might have been timing chain related but got one side fixed today (have not tried to crank yet) and gonna do the other side tomorrow I am talking about the upper tensioners the passengers side one looked like Yes I know that is bad but the timing was pretty much still spot on. I won't know for sure the shape of the other one till tomorrow once I get the fuel line out the way so I can remove the other sides valve cover. I am assuming it's gonna look about the same, cause the passengers side was not actually making any noise. I was having some noise on the drivers side prior to the car not cranking so I had prepared to do this before. But like I said I am assuming only cause the timing was dead on other than the lack of the top of the tensioner being there which corrected soon I got the cam back in place. My question though is when I had the oil mount and oil cooler fixed a few months back, the car had got drained on the oil and the car had some issues with the lifters after that the mechanic said but they got the oil back in and got it sorted. I had to again take the oil out the car when I dropped the oil pan to change my gasket. My question is was there anything special I needed to do once I got the oil back in it? I did not think the Lifters on the LS were the tradition style from what I have read on here, so I am a bit confused on what to do. I am obviously gonna fix the other side of the upper tensioners before I attempt cranking it again. But I am just trying to be prepared cause I really think the reason it would not crank is the lifters since that mechanic had the issue before when oil got taken out the car. Also how hard are the lifters to change and can anyone link me to the correct part number? Many thanks in advance.