. re adjusting the rocker arms!
jack up the o/s/f wheel and put the car in 5/6 gear. turn the o/s/f wheel in a forwards direction to turn the engine over and watch the each rocker arm "come on cam" when no.1 is at the peak of the cam lobe, adjust the 6mm allen key
. wind it all the way down till you feel resistance, then back it off 270 degrees (3/4 of a turn). tighten up the 18mm nut.
turn the wheel/engine again, you won't need to turn it much til no.3 is on cam. do this one in the same way.
and then no.2.
done. stick the rocker cover on. (you shouldnt need to change the gasket as they are rubber reusable things, just give it a wipe down to get excess oil off it.).