If I understood correctly, you swapped from 1.5 to 1.6? If so, you gained almost .050" in lift. Was guide-to-retainer clearance checked? (Unless I missed it.) But higher ratio rockers do put more stress on things because of faster opening and closing rates. More spring pressure is usually needed, but you seem to have a good bit.
I switched from 1.5 rockers to 1.6 to account for net lift loss after correcting the valvetrain geometry. Originally I had .525 net lift with 1.5 rockers and 90 degrees at full lift. After switching to 90 degrees at mid lift my net lift was .500. When I put the 1.6 rockers on my net lift is .540.
Coil bind for these springs occurs @ 1.16 according to the spec sheet.
Given that the valves actually rotated for what I believe is the first time, I'm starting to think there were some harmonics occurring.
Obviously it's time to dump the rockers but I'm thinking some different valve springs may be in order as well.
Without getting stones thrown at me, anyone ever have luck running the steel PRW rockers?
