yes they do, take off valve covers and adjust rockers as noted in repair manual
Rocker arms are under the valve covers.
Take off the rocker covers and see if any of the rockers are very loose.
Dialga is from the Sinnoh region. Pokemon Ranger only covers Pokemon from the Kanto, Johto and Hoenn regions, so Dialga cannot be caught in Ranger.
All tonneau covers are custom designed for each bed. All tonneau covers for the 1996 Ford Ranger flareside will only fit Ford Ranger flaresides from 1993-1997. Whether ARE makes a model like that, I do not know.
If its the standard height, nothing. If they are screw in studs with tall nuts, then you will need tall valve covers.
remove intake manifold and rocker covers. loosen nuts on rockers and remove pushrods. lifters should lift right out of their bores.
I think what you are wanting is the air gap between the flywheel and the coil . The gap is somewhere around .002 in , but if you will take 2 matchbooks take off the covers and use them for spacers between the coil legs and the flywheel . Role the flywheel around till the magnet pulls the coil in . Place the matchbooks between the coil arms and the flywheel and tighten the screws . Check the spark plug and make sure you have good fire .
From the front of the head it's EIIEEIIE. This is the same on both sides - (I=Intake, E=Exhaust) With the valve covers off the rocker that aligns with the exhaust port is the exhaust the other will align with the intake manifold runner this would be your intake
Remove distributor, disconnect hoses and cables from carb and intake manifold. Remove intake manifold.remove valve covers,loosen rockers and remove pushrods Insure that pushrods go back onto the same lifter,and rocker.remove exhaust manifold,remove head. clean gasket surfaces. Install new gaskets, reassemble.
If you have a 2001 or newer engine, it comes with roller lifters and roller rockers from the factory.
only time you would need to replace valve covers,is if they are dented and allowing rockers to hit inside cover,or they have holes in em letting oil leak out. you may need to change valve cover gaskes as now and then they will leak oil