What is the conventional wisdom re: proper timing chain play and timing
chain replacement? My motor (which has 65K miles on it) is out of the car
waiting to be reinstalled after a repaint, I have new timing gears from the
previous owner so all I'll need to buy is the chain. It appears that my chain
about 1/2" play on the tensioner side (using my ultra-scientific measurement
technique of holding a screwdriver against the chain and marking the block
at each end point of chain flex). Part of me says to just go ahead and replace
it now. But I'm so prone to shipwrights that I thought I'd see if this
would be just another unnecessary repair having no real impact on performance.
When the car was running, it did run a bit rough and timing seemed to drift
a bit but I could never trace this to a timing chain problem.