Originally Posted by raptor660
could replace rockers, intake and drop a pulley size. shift kit. if ur motor is healthy enough, maybe a 50-100 shot of NOS
That just about sums it up.
Roller rockers are $350 on zzperformance.com. I just sold a used set to someone for cheap. They're advertised to gain 10%, so in your case, 20hp?
If you want to improve performance on your car, you need to port your heads, plain and simple. The S1 3800 heads have terrible casting imperfections and overly small exhaust ports that you can do worlds with if you had a dremel and a few grinding stones. I can post up pictures of the work I did on mine when I get home, just send me a PM to remind me.
2005 Pontiac Bonneville GXP - For Sale ----- 1995 Buick Regal GS(X) - L67 madness
2000 Buick Regal GSE - Stock...for now
----- 1987 Jaguar XJ-* V12 - 12>8