[Kris86]

I notice this image here in the service manual with the section with timing the left head.

I see a mention with the sub image at the top it's showing something with a 25degree adjustment, could this be related ? :-S I'm not a mechanic so I'm just looking explanations, shouldn't it be that once the timing marks are pointing to eachother then it's correct? Or is there some kind of 25degree adjustment to be made. ( my left head Intake cam is advanced around 20 degrees at idle but jumps around to as high as 25 I think I've seen)