hi welcome to nico. SEARCHING is highly advised, but...
have you downloaded the Factory service manual? this thing your on called the World wide web has a whole crap load of info on it. TRY using yahoo or google. I just typed in "r33 factory service manual" and the first site had the "r33 all engine manual".
but because im bored heres a link to down load it. (right click save as)
http://carfiche.com/manuals023...l.pdf
keep in mind this manual has all motors that were available in the r33 skyline so pay attention and dont confuse rb25,rb26 etc pages, with the rb20 pages.
if you get confused by the manual give up.
emm spoon fed