no you do not have to go thru solids any more then one or two times a year i use solids in all my own builds but for most all street and mild strip use the hyd roller is the way to go. you keep thinking that 520 is a deal and it is ok . BUT you do know there 3 makes howards hyd roller lifters and the ones in then kits are lower rpm lifters .i have some hi hp solid roller cam to