The clearances on the openers can be tight, 0.1-0.15mm isn't much of a gap.
Might be tight if the valves have seated down a little into their beds, no lead in the fuel does mean a little more wear despite the additives.
General thoughts...
only rotate in one direction if you have the belts on as their will be a little lash in the gears so back and forwrd to TDC may not be helpful!
As you're probably changing the belts check with them off, much easier to rotate just the cam accurately to TDC
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