If I were you, I would scrap the “summer project” and save the money for an upgrade to the Ultra. Is it possible to just bolt SC on? The answer to that is
NO! There are other possibilities, though, and none are cheap.
The reasons this will not work are extensive. The NA power trains are actually quite different when compared to the L67 (SC). The heads are different, the rods are different, lower intake is different, different injector placement, the fuel rail is different, and the compression ratio is different. Also, the pushrods, lifters, and rockers are not the same. Many of the accessories such as PS & alt have different mounting and pulleys. Now for the big one! The L67 SC comes with a heavy-duty transaxle also. Either the 4T60-E (HD) or the 4T65E(HD). Then there's the PCM, and the engine wiring harness to go with it. This doesn't even get into the little things. About the only thing these cars really have in common other than outside appearance is the Throttle Body.
So what are your options? First, you can find a salvaged SC engine/transaxle, and drop the whole thing in. The engine, trans, wiring harness, and PCM combo. You can get one from an Ultra, Bonneville or a Grand Prix. Very expensive by the time you're done! If you really want this, you could sell your car and buy a newer SC Ultra, for less money and a lot less work.
Second option would be an aftermarket Supercharger. This mod will run you over $3000. You would still have the problem of possibly killing your transaxle, because you still don't have the heavy duty version. Once again, you could sell your NA LeSabre, combine it with the $3000+ you would spend on this mod, and buy a newer Ultra.
Another option, which is more practical and a little cheaper, would be a Turbo. There's room for it, and they're easier to set up. It would have to be a custom job, because no one makes a kit YET.
In a nutshell, there are many external and internal differences between the supercharged and non-supercharged models. Adding more brackets and offsetting belt paths with a double-belt harmonic balancer, new PCM programming, and the rest of the drive train......this whole procedure gets VERY involved.
Has anyone added an Eaton supercharger to an L27 or L36 yet? Not to the best of our knowledge. Is it possible? Yes, but not PRACTICAL.
To do this, you have 3 options:
1. Try to add one. Very expensive and labor intensive.
2. Do a full engine/trans swap. (Engine, Trans, wiring harnesses, and PCM).
Slightly cheaper.
3. Sell your LeSabre and buy an Ultra. By far, the most cost-effective solution.
