I’m decarbing the intake this weekend. I’m not finding a clear way to rotate the cam to ensure closed valves as I progress through the cylinders. Some say turn the alternator but that may throw off the timing. Is this correct? What’s the best method?

I need to tackle this job on my son,s car asap, but have a few questions before i start. Firstly, is there a decent tutorial i can download to help me through it?

the few youtube clip show lining up TDC first before undoing the crank and cam bolts, would it not be easier to undo first,...

This will sound silly, one day I looked for a timing plate and looked upon a small 4lined thing that at the time didn't get attention because I just didn't know how, NOW when I look to use it I can't find it. In manuals the only reference is about marks on a wheel TDC but nowhere is it specifically...