How to measure rocker ratios and question about heads

Iam currently trying to figure out what ratio rockers I have and dont know how to tell if they are 1.6 or 1.7's. I dont think pictures will will help the rocker problem but I'd like to make sure that I have World products SR heads and not the Jr's(even though those are the ones I need). Sorry for the crappy pictures...Thanks.
 

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