Well, today I finnaly test drove that L67 LSS. Let me tell you, WOOAA, that car can MOVE. No BS it chirped into second @ 45mph. However, it has one problem that sounds bad. When at idle, in drive, there is a rumble, clatter, rumble sound that comes from under the hood. Is the supercharger on the fritz or what?? Its a 95' with 225hp and 275 tq. Another thing is it idles @ 900rpm in drive, is that normal? I thought most cars idle between 500-700rpm.

Could possibly be the harmonic balancer. I know it is one of the most common troubles of the Series I L67'*.
P.*. There weren't many Sereis I L67 LSS'* made. Thinking about buying it?

Yes, the dealer said he would drop the price under $3000 so I don't have to pay sales tax. Now, the harmonic balencer. How much would it cost to replace that?

You MAY be able to find one at a junkyard for cheap.
Look for a rear-ended car.

Please don't buy a used balancer. GM really messed up with them and they all required replacement and if you get a used one you are most likely going to get one that may fail sooner than later. A new one aftermarket cost me $200 CAD and that was about 5 years ago and it is still going fine.
You really have to find out what that rattle is under the hood before you make a purchase here. Supercharger pully (cheap), alternator, or balancer, these are the main things that go creak in the night at idle. Either way you are still looking at under $300 to fix any of it. Get the dealer to pin it down for you.

you are gonna be replacing that supercharger pulley either way

more thsn likley, yes its sced.

It could be a bad coupler too.

You took the words right out of my mouth.

My thoughts were to replace the $30 part, and not the big one first