Keith Craft Keith the beehive springs work great up to about 6,700 rpm where they loose control of the valve train. My motor with the BBC springs gets a float at 5,800 rpm but pushes through to the 6,200 max. A have the stock Shelby valves in the heads with Erson rockers, Smith brother pushrods,( hydros ) and the Crane Hydro lifters. This is a heavy mass to control at 6,000 rpms. Jay's motor should be able to work to the 7,400 rpms with beehives. Harmonics will be the question. A lot less spring load also. Maybe going to a smaller Valve stem would help also. from 3/8" to 8MM would also remove some weight. I think that there is a limitation also to a off set rocker arm for this motor. Retainers or not, there must be a twisting of the rocker on the shaft? I wonder if going back to a stock rated spring and rerun the rockers with the new adjuster would this help. Maybe they need to design a new rocker without a adjuster and use valve stem caps to make the adjustments for valve lash with??? Rick L.
