Cam Rocker Ratio Choice

You are lift limited by the rocker gear. I would never use a 1.7 ratio rocker that has Chrysler shafts. The shafts are too big and the adjuster is too close to the shaft. If you use an aftermarket shaft rocker set up I think you can go reasonably to a 1.75 ratio. The issue with a 1.5 verses 1.6 ratio with the same lift is the 1.5 ratio will be a much more aggressive lobe to get the same lift with the same duration. If want want say to net .600 lift and you don’t need 260 degrees at .050 you’ll need a 1.6 rocker or higher to get it done. Otherwise you end up with more duration than you need to keep the lobe reasonable. Always use the highest rocker ratio you can fit in there correctly.