Here are the specs for the Melling RYB-10 camshaft.
Lobe lift is 0.296” for the intake and 0.298” for the exhaust.
Duration is listed as 276° for the intake and 280° for the exhaust.
No lobe centerlines are listed.
Also found are two different Melling Y-Block camshafts with the RYB-1 designation.
Both of these are listed as having a lobe lift of 0.290” for the intake and 0.294” for the exhaust.
Version 1 is listed as having an advertised duration of 276° for both the intake and exhaust.
Version 2 is listed as having an advertised duration of 308° for the intake and 310° for the exhaust.
Lobe centerlines again are not listed.
Unfortunately with the lobe lift being the same on both of these, it will be difficult to know which version is in hand without either putting it on a Cam Doctor or installing it in an engine and reverse engineering the specs with a degree wheel in place.
And for any camshaft, if you want to verify the lobe lifts, use a dial caliper or other measuring tool and get the values for the dimensions as shown in the above pictures. And here’s the formula once you have those dimensions.
A minus B = lobe lift.