Engine builder says to use valvoline 20w50

[highperf4x4]

When you adjust the lifters for a hydraulic camshaft, you set the lifters with 0 lash and then go another 1/4 turn. You never try to pump the lifters up before you install them. They will pump up on their own when the engine starts. Since there is 0 lash with a hydraulic lifter there should be 0 noise coming from it when it starts. If you've set them properly, you also do not need to "adjust" them after you run the engine. If you have valve lash (noise) then something has given out or they weren't set properly to start with. Either way, you're screwed. If the noise starts to go away, the cam lobe has probably been ground off completely, hence, the lifter is not moving at all. If it's an exhaust valve, it will start backfiring through the carb when the intake valve opens. Good luck!