1990 L98 hp increase?

got a 90' trans am gta with the L98 and i want to know what can be done to max out the hp on this beast

Start with the exhaust system. That means headers, high flow cat(s) and a cat back with a good muffler. After that any furthers mods will be enhanced more than they would be otherwise.

Welcome to the world of engine and car modifications.

I say first, ditch any excess weight you got, and give the car a nice tune-up. Gets you back to stock, and lightens ya a bit.

I heard people doing LT1 parts swaps onto L98s. And of course, the dreaded response, SEARCH!

If it were mine, I'd put a supercharger on it after upgrading some other parts.

Here is a pretty good place to get some parts.
http://www.tpis.com/

This would be a good practical start
http://store.summitracing.com/partdetail.asp?autofilter=1&part=EDL%2D3890&N=700+115&autoview=sku


or maybe this If you really mean max out
http://store.summitracing.com/partdetail.asp?part=EDL%2D2097&autoview=sku
http://store.summitracing.com/partdetail.asp?autofilter=1&part=EDL%2D1411&N=700+4294925239+4294839063+115&autoview=sku

I decided on a crate motor but If I had to do it all over I would have just built my L98.

First do a full tuneup, new Delco plug wires, new plugs, belt, fluids; motor, tranny, rear. That will make a nice driveability difference.

Then do the free mods; plenum porting, TB bypass, and increase timing from 6* to 10 or 12*. That will give you some good gains and for practically nothing.

After that, get some Long tube headers, and full exhaust or a cutout. After that look into a set of used SLP or ASM Runners.

Then do gears and a stall. If you have 2.73s, step up to 3.42. DO NOT GET 3.73s. TPI is not a topend kind of motor. It's all lowend. 3.42 is PERFECT for TPI. If you have 3.23, then stay with them. You won't gain much going from the 2. Maybe a tenth for $4-500. Not worth it. Then find a nice 2600-3000 stall. Again, 3000 is it for TPI.

With those mods and maybe a set of 1.7 rockers you SHOULD be right around a low 13 or high 12 depending on traction, condition of the drivetrain, and track location.

I heard people doing LT1 parts swaps onto L98s. And of course, the dreaded response, SEARCH!

The LT1 swap is probably one of the easyest as far as swaps goes, and I personly would recomend it if you wanted to go that route.
Another good place to look is Thirdgen.org they have alot of information about TPI motors there.

Put a big block in it and never look back ..Yehaa