A roller cam is normally associated with hard-core race engines, but several companies make street rollers that are docile enough for a daily driver, yet still make serious power. Hydraulic and solid, nonroller cams are also called 'flat-tappet' cams. A solid-lifter cam is beneficial in high-rpm applications (6500 rpm and higher), but it requires a lash adjustment every few months. TYPE OF LIFTER: A hydraulic-lifter cam is the best choice if the car is to be a daily driver, because it doesn't need periodic lash adjustments.
