Thread: Top Swap on a 2004 GP-GT 3800 SIII

For your car you will need a gen 5 blower and the drive by wire tb to go with it. You will need a custom tune on you pcm. Most of the wiring is the same. That is about all I can tell you since I have never done the swap myself.

Originally Posted by 01GTP

For your car you will need a gen 5 blower and the drive by wire tb to go with it. You will need a custom tune on you pcm. Most of the wiring is the same. That is about all I can tell you since I have never done the swap myself.

Thanks for the info

I found the thread you was stating and found the parts list, Looks like some work but then again performance is always work.



PARTS LIST

Heads from SC motor (Either Series will do, all the blocks are the came so all the heads can be interchanged)
Head Bolts, can be OEM replacements or Studs, up to you(Stock are Torque to Yield(one time use)
Thread Sealer (the head bolts go into the coolant jacket, and if they aren't sealed, they will weap coolant out)
Head Gaskets
Rocker boltsSame reason as the head bolts
Valve Cover Gaskets
Harmonic Balancer From the SC motor
Tensioner for SC belt
Idlers for Sc beltThese require bolts that aren't on the L26/L36
Coil Pack BracketThe tensioner and one of the idlers bolt to the SC Coil bracket (some 97 and 98 cars may not need a different bracket)
Lower Intake Manifold from the SC motor(The bolts are the same, so you can use your old LIM bolts if needed)
Lower intake Manifold Gaskets(the Aluminum ones are the Best)
Fuel Rail(you need the one that matches your fuel system, 97-03 gets the standard rail, while 04+ needs the return-less)
Fuel InjectorsAre not a requirement, but you should run the SC injectors or better flowing units
**Injector connectors may be required on some years
Supercharger
Supercharger Gasket(If you use a Gen III M90 you need O-rings as well)
Supercharger Belt
Throttle Body from SC motor(This isn't required but recommended)
Throttle Body Gasket
Colder Thermostat I Recommend 180*, but that is all personal preference
1 Step Cooler Spark PlugsUsually recommended for the Top Swap
Fluids Oil(a change needs to be done after Swap and before engine is started) Coolant(you will loose a good amount doing the Swap
Oil FilterFor above change
Tunned PCM Stock Gt settings are way too aggressive for a SC application, I suggest a tuner, but if you don't have time, a Canned tune can work
Exhaust Manifold Gaskets (optional)