The plunger is partially removed from the lifter body; the retainer clip and pushrod cup having been previously removed. Roller lifter also allow the use of more radical cam lobe profiles with faster opening and closing ramps that allow more total valve opening for a given lift and duration. Check out what went into this 2,000-hp LS engine build. Youll be covered in horsepower in no time! The overhead valve design added complexity to the valvetrain because it required the addition of pushrods and rocker arms. This is done by rotating the crank so that cylinder is at Top Dead Center on its compression stroke with both valves fully closed. As mentioned, one may avoid this by using the manufacturer-recommended grade of engine oil, and by not exceeding the prescribed oil change interval. intake valve lash all about the same and the exhaust valve lash also all about the same. Frequently, the valvetrain will rattle loudly on startup due to oil draining from the lifters when the vehicle is parked. Some experts say hydraulic lifters should be presoaked in oil and bled prior to installing them. To replace a faulty lifter with a new lifter (or to replace a used cam with a new cam, reusing the same lifters) is to risk cam and lifter failure requiring the engine to be torn down to remove the shrapnel left from the destruction of the cam lobe(s) and lifter(s). It sits on the camshaft and transfers the motions of the cam lobe up through the pushrods and rockers to open and close the valves. Solid lifters require regular valve lash adjustments to compensate for wear in the valvetrain. Either of these lifters are designed to be used with