Even every engine I have encountered with a belt-driven valvetrain is about the same, with one simply aligning timing marks.
Granted, I mainly come from the world of engines with timing CHAINS which have their own quirks, but basically if everything is locked to TDC, there's no mystery. While there are countless threads discussing the setting of the Torsion Value on PD engines, I have yet to find a good technical description of why it even needs to be messed with (versus zeroing it) and why it is a thing at all.
