Oh yeah, I cant seem to find anything about what the difference is in the solid roller and hydraulic cam shaft themselves..are the lobes ground on different profile on the solid for the solid lifters?is the core material different?All I can find is the solid uses solid lifters and the hydraulic uses hydraulic lifters and is it bad practice to mismatch the two?ie solid roller with hydraulic lifters and vice versa apologise for all the questions but you guys did say fire away lol