My heads have stage 1 valves. The person that installed them sank the valves about .030 deeper than stock. I have shims under the springs to get the spring tension back to specks but I am curious about the rocker arm geometry. If a .490 lift cam drives the rocker arm down further than stock , would'nt the extra stem height help split the difference to a point? At what point would the rocker SHAFTS need to be shimed upward to reset the the geometry? (I have adjustable pushrods, so no problem with lifter preload.) So far I have never broken any rocker arms, but a future cam change could cause problems.
You'll be ok. Are you running stock rockers? At the stock ratio you will be fine. The rocker pivot is so short that you have to keep close as possible to the 1.87 installed height as possible. A 1.900 installed height will carry you close to .700 lift in the stock configuration with aftermarket rocker arms. Usually you have to run a higher valve stem height for a spring to work with a high lift cam. Sinking the valves tends hurts mid lift flow. I would worry about what happened to you flow numbers more than anything if your concerned with power. With the roller rockers, if you sink the valves much beyond the 1.870 stem height and try to run a roller cam spring you run into more spring/retainer interference.
