I got this info from Randy at Custom Speed (mfg. of HS rockers).
HS does not stamp their rockers for ratio.
To determine the ratio you have, here are the measurements.
1.5 ratio... .370 inch.
1.6 " ... .440 "
1.65 " ... .480 "

this measurement is from the center of the pushrod receiver to the end of the rocker.
this is for SBC roller rockers.

I hope I explained that well enough.;)

David

My 1.5s are marked,not the 1.6s.Both sets are old though,the 1.5s being older.