I have a couple "Extra" '99 GP super charged "top ends" ( heads, intake, blower). are there any "power adders" that I can do at home to make a worthwhile improvement ? (port?

so, No One has worked a SC TOP End before installation ?

Here's a DIY thread on Grand Prix Forum about porting the heads (slightly). It works if you have the right tools. I did my old set of 00 L67 heads on my other car.

http://www.grandprixforums....d-porting-guide.html

There are some other things about porting the SC inlet and outlet as well as the LIM.

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03 Buick Regal. 13.0x @103
87 Fiero GT. L67, XP, Ported heads, SD headers, FSIC, 2.8 pulley. 12.1@111 1.7 60'.

I cleaned up the outlet on my SC during my build but did not get carried away. after a good deal of research I found that unless you are racing and willing to have someone do flow testing you can do more harm than good. I opened up the V and smoothed things out. I was only going to a 3.4 pulley and did not want to have to add water injection or deal with spark knock.