Um how about because your F*&#ing wrong and your huge head won't let you realize it?? Your arrogance is highly over-bearing and annoying. That's what our problem is with you.
Im not wrong. You said there is no engine out there that doesnt have a specified timing chain service interval. Audi V8's dont. So STFU.
Do you think maybe there is a reason the Dmax runs a gear on their cam and not a chain like a BBC? Or no probably they just do it just because.
And 6.2's/6.5's, and a bunch of other OTR heavy duty engines run chain-driven cams. So whats your point?
Go take an engine mechanics trade school course and maybe you might pick up a thing or two
Oh wow a TRADE SCHOOL COURSE!!! Yeah, I should go take one. I bet the knuckledragger teaching the class might even tell me what a piston does.