Not so sure ^^^ is accuate especially with a hydralic cam. Lifters will take more of the abuse away from the valvetrain over a solid. As stated in the post above, I spun my solid lift flat tappet 289 7500rpms on a regular (more like daily) basis (4.11's w/toploader 4 spd then 4.56's). My 66 had this motor and I drove it to school my junior, senior year and a couple more years after that, before the cam pin broke.