A person messaged me if we had ran different rocker ratios during our 610ish dyno pulls so far. The answer is yes, we have used 1.7 ratio rockers. The results are mixed. With a lower lift cam, like a stock camshaft, or a flat tappet camshaft, we gained power. There is a graph of this in either write up #1 or 2. We gained about 10 HP each time we run a flat tappet camshaft. With our highest power combination, which isn't published yet, about 580ish HP, we actually lost 10 HP with the higher ratio rockers. We have tested this a few times in the past with more aggressive camshaft, meaning hydraulic roller, and it's either no gain or a loss when the cams are near 0.600". This makes sense based on the flow data from the cylinder heads. I can get very specific if you want me to, with dyno graphs and what not. We see a loss of low end torque/power and then a cross over point and then it makes more power, just like a larger camshaft would show. In the latest write up, which is not published yet, I started adding in average power and torque across the dyno pull. I don't know what the averages would be for this combination but I can look it up.

Feel free to ask me anything, either on a forum or in PM, but I will probably answer in public, as all the time/effort/money spent is to better the knowledge of all of you.

jerry