One thing I wanted to make sure I stated clearly. Well over 90% of issues people think is their timing chain stretched is not the actual issue and the chain is not an issue at all.
The chains are actually holding up better than I would have hoped given the design of the timing system and the amount of stress and stretch applied to specific areas of the primary chain as the chain runs past a critical location with a not ideal tensioning position.
The clacking cold start ďtiming chain stretchĒ that everyone says is NOT correct info almost 100% of the time. Itís not the chain clacking loosely slapping or anything of the sort. It is the intake cam phasers being pushed too hard (in many many cases) and the 60 degrees of variable cam timing ford allows them to move, is a LOT of phasing by all standards. Now this CAN be exacerbated when tuned for max cam timing and power because your intake cams live more in the -60 deg world optimized for performance. The wear the phasers are prone to causes oil to drain back out of a location internally it should not be draining back, and wear is allowing the oil to drain down through the excessive clearance or wear area. Hence when cold starting the phasers have zero oil pressure causing the clack which is them moving side to side with minimal internal lubrication.
We can pin the phasers (intake only) 5-10 degrees and eliminate this wear.