There is a very specfic procedure for adjusting the valves in the DeLorean. You must follow this and be sure the cam lobe is in the proper position for each valve adjusted. Once you understand it, it's fairly simple but you must understand what you're doing or you'll have some expen$ive valve train problems. Bruce Benson >The adjustment of the valves is > fairly simple, follow the procedure in the shop manual. It will > require you to remove the valve covers to access them. The adjustment > screws are in plain sight right ontop. You will need an open end > wrench (I don't remember the size of it off hand) and a screw driver > to to turn the adjusting screws. The nut on the screw is a locking > nut so make sure you tighten it back after you adjust it. It is > common to perform routine adjustments to a non-hydraulic lift system > like the Delorean setup.