Take the valve cover off and using an orbital sander, drimmel, and by hand sand paper and sand it starting at 120 grit, then work your way up to like 600 or even 1500. Once it's all perfect and sanded like that, go to harbor freight and get some white tripoli polish, apply it to a buffer wheel, and polish away...bling bling in no time.
go here:
http://johnmonnin.netfirms.com/Polishing.html
there is detailed info with tons of pictures on polishing. Even though its a walk through for 3000GT parts, its all generally the same.