This might be a massively long shot. But can anyone tell me whether this is a shrick cam?

I’ve been battling with a weird choppy idle for a while now and while doing the valve adjustment the other day I noticed these two yellow stripes on the cam.
I found out my head gasket needs replacing after doing the valve adjustment but while researching parts I noticed that schrick cams have the same yellow stripes. Not got any better photos at the mo and I’ll get more when the head comes off but this would absolutely explain my idle issue.
Thanks