Timing confusion Options

[914itis]

Ok, either I am dumb, confused or a combination of both.

I am having some other issued with my car and decided to recomfirm timing once again. I went back to the pelican web site to make sure i got it right, then run into this. I was able to fing my timing mark on the impeller. I first followed the main instructions with thr first picture, showing how to to mark the 27 btdc



Then at the end there is a post by the much respectable Dave, showing an impeller with both the tdc and 27drgree btdc. (see pic #2)



the blue arrow shows factory tdc, red shows factory 27btdc, according to the instructions and template, should'nt 27btdc on the brown arrow?

[TheCabinetmaker]

You have it backwards Paul, the red arrow is tdc. The blue one is 27. Your timing light should line up the notch(blue arrow) on the fan with the notch on the fan housing shown in your first pic. That notch in the first pic is your reference point for timing. its a constant. The notch on the fan moves as the distributor moves. At approximately 3000 rpm The fan notch should line up with the notch on the fan housing.

Edit: 3000 rpm is just a close point. Raise rpm till the timing ceases to advance and read it there.