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So in theory, if we could've replaced the actuator with the updated revision before the chain began to stretch, we wouldn't have to replace all the other components? Edit for clarity: I'm going to replace all components even though they're in good shape visually, it's just curiosity at this point.

So basically even a tiny groove in one spot on the cover indicates a worn actuator? Chain is tight at TDC. I'll probably do it as a precaution but I'm more curious than anything.

2006 Mazdaspeed 6, 78,000 miles VVT has never been done, but I thought the high pitch squeaking I've been hearing at cold startup was the timing chain (although it doesn't sound like a rattle). I've started road racing the car so I figured I should get this done before the season starts. As...