series 1 s/c and na

What are the differences between the series 1 l27 and the series 1 l67 besides the fact that the l27 has a supercharger?

l67* has super charger

Really the only thing that differs between the 2 is the compression ratios (higher on the N/A engine), and the upper/lower Intake manifolds. Everything else is pretty much the same except for a couple of wiring harnesses and the PCM.

so how difficult would it be to supercharge?

Rods and bearings in the l27 don't like boost. People have done if, but never successful for long.

http://www.pontiacbonnevilleclub.com/forum/viewtopic.php?f=44&t=194

If you are set on the l27 then turbo it. But for the money and effort, just swap in a series 2 SC. Its cheaper than even throwing in a series 1 SC. Series 2 SC should be able to go in whatever you've got if you take the wiring harness and PCM.

L27 + supercharge = eventual fail.

L67 is what it is because of an over-engineered bottom end. I was told but can not verify that the L67 bottom end can take well over 900 (brake) horsepower.

If you look around a bit odds are you'll find an L67 in a junked oldsmobile 88LSS or 98, or a forgotten high end Buick Century, or a plushed-out Bonnevile just waiting for you for short money. Try phoning these guys:

http://www.horseheadspickapart.com

and ask if they have any GM cars with the supercharged 3800 sitting in the yard. They usually have 2 or 3 at a time that are rebuildable. Check price. Then try a junkyard near you and use the price you got to work 'em down -- IF you are prepared to buy. Cash talks.