Most people have a problem with installing a TB spacer and the coolant blowing out the gasket on the side of the supercharger. Here is a mod that we've done to a few cars in the last couple of years with no ill effects. Yes you can plug the passages at the LIM, but this is for those that are simply installing a TB spacer. If anyone has any pictures that I can use to add to the write up it would be appreciated. I only have a pic of the finished project.

Preface:
Make sure the engine is cool before starting this project.

Items needed:
Other than the items provided with a spacer.
2 - 1/8" NPT flush mount plugs(hard to find, check Ace or True Value Hardware)
Thread sealant
TB gasket(unless installing a spacer you should have received 2 gaskets)

Tools:
10mm deep well socket
Hex key(allen wrench) that fits brass plugs.
RTV sealant(recommended)if you want to back up the gasket.
Cutting oil for the tap. Since it's aluminum and you're using a hand tool you can probably get away with motor oil.

1. Remove the TB by disconnecting all the electrical connections and the throttle linkage. the throttle linkage is just a couple of quick connectors and figuring out how they work can be a challenge. Next there are 3 mounting nuts that need to come off 10mm I believe. Be prepared to lose about a cup of coolant. Viola, the removal is done.

2. If you are installing a TB spacer follow the instruction on removing the OEM studs from the SC. If you are not installing a spacer go to step 3.

3. There are 2 ports on the supercharger at the bottom of the mating surface between the SC an TB. They are the perfect size to accept a 1/8" NPT tap without drilling. Run the tap about 1/2 way into both of those ports.

4. Scrape all the old gasket off of the mating surface and use a shop vac to suck up the aluminum shavings and gasket material. Make sure you suck out the coolant ports nice and clean.

5. Put some thread sealant on the 1/8" flush mount brass plugs and install into the newly tapped holes with the appropriately sized hex key wrench.


6. If you are installing a TB Spacer continue on with their instructions. If you aren't installing a spacer, clean the TB of old gasket material, install new gasket and reinstall TB. 89lbs/in is the spec. for the 3 nuts. Make all electrical connections and don't forget the throttle linkage.

7. Inspect all connections and start the car. Ispect for leaks and top off your coolant.