What is the correct timing mark on a 1986 Chevy silverado 350?
the widest one on the timeing chane cover right in the middel of it
It uses a timing chain and sprockets. I don't know how many links are in the chain. It doesn't normally break like a timing belt does, but it does wear out and can cause timing problems. If it is allowed to wear far enough it can jump a tooth and that usually stops the engine from being able to run.