[GTP Version 2.0]

I'm trying to isolate the knocking noise coming from the engine bay. I'm not sure what it is but I'm trying to narrow it down to save money. I'm afraid its a bad rocker (ZZP strikes again). Some conflicting statements on the website state that 1.84 is the highest ratio permitted on stock valve/springs/retainers yet they say their 1.9 modified high ratio rockers are ok for stock valve/springs/retainers. Is the word "ok" translatable to "you're risking your engine life" or "good for 20k miles"?