Technical Ford Y block rocker dimensions

I am trying to find a rocker that will retro fit fairly easily to my Model T Frontenac head. I have been told that Ford Y block rockers will fit.

I'm sure someone here must have a Y block, could someone be so kind to take a measurement from the center of the pushrod ball to the center of the valve tip area for me?

 

bump

 

Will this help. First is a ecg rocker, next is the 575 rocker.

 

@egads , I didn't know there were two different rockers. I assume different ratios then?

Looks like I'll be looking for those "575" rockers. Those should fit my needs I think. Just need to find a inexpensive set with shaft.

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PM me.