OK, I was assuming 1.5 rockers.
1.6 rockers do make more lift (at the expense of more pressure on the cam/lifter)... are they actually making more power though? It seems not to be guaranteed, but more of a "try it and see".
Making power is about valve lift and valve speed. Of course, you need to consider your minimum cross section and what the valve gear will take and if you can live with the lobe.
One issue that always cropped up for me was with my displacement (345 CID), and the tunnel ram about the best I could do was .750ish lift, because the next series of lobes that I wanted would have either had too much duration or the lobe was so aggressive I’d be looking at 25 runs for a set of springs. And that was 25 runs IF I didn’t get jacked up in the burn out or not pay attention and miss my 8800 shift and turn it past 9000. That’s a valve spring killer.
If I was 400 inches I could net .800 lift, but I wasn’t so I couldn’t.
