I'm thinking that you are starting to see what I'm saying. You are looking at most 5 WHP from 1.84'* with stock springs then 1.95'* with 105 springs - It is actually more like 2-3 WHP. Is 2-5 WHP worth $150-$190 for the cost of springs and retainers? I don't think so.
Here is another artical on rocker ratio'* and RPM.
"We spent a lot of time optimizing ratios and studying the market for rockers. Most people are in one of two categories. Those that don't want to change valve springs and those that do. We did extensive research to determine optimal ratios. We researched where valve float occurs with each ratio, what the difference there is between a used set of stock valve springs and a new set, and what RPM is optimal to spin your engine to vs. what rpm are people commonly running.
What we found is that even with stock shift points and the super light weight of our rockers, most people running higher mileage valve springs will still get valve float with our 1.9 ratio rockers. What we also discovered is that we could run very close to 1.9 if we kept the shift points stock (1.8
. The problem is that there are gains to be had shifting higher. The second problem is that most people running rockers have an aftermarket PCM with raised shift points already. So to explain in basic terms: You are better off performance wise, running a 1.8 ratio with 6k shift points than you are running a 1.9 ratio with 5700rpm shift points.
Once we settled on an optimal shift point, we set out to pinpoint the optimum ratio roller rocker for use with stock valve springs. A ratio that would give the highest possible gains without the risk of valve float, even on higher mileage engines. We cam up with 1.84 and while this may seem a lot less than the 1.9'* you keep the benefits of the lower spring rate. That means less tensioner wear and slightly less rocker deflection. "
Down under a company has been selling 2.0 ratio rockers for quite some time. Yella Terra cam out with 1.95 ratio rockers because that is what is safest without worring about the pushrod hitting the cast of the head. The 1.95 have been out since spring but ZZP has been testing them and different ratio'* for close to a year.