Thanks. I was just telling my wife the same thing. I just need to take a day off from work. I have a long weekend coming up so I hope to get most of it done by then. I still need to fix the upper control arm thread insert. Aside from that, everything from here on out is a piece of cake.

 

Productive day....it's alive!!! I'll post a video up soon.

The kooks headers in a C5 are a bitch! They go in from the top but I had to take steering shaft out, valve covers off, oil pressure sending unit, oil filter and then jack up the motor leaving the opposite side motor mount bolt on. Even then it took some prying but they finally fell in.

Wired up the Lingenfelter converter box. Extremely simple...plug and play with 1 ground and 1 12v switched source which I got from underhood fuse box #19. Mounted it on the firewall. I'll be getting some insulation for it to keep the heat away as much as possible.





I also fixed my HVAC display. It was blank, but I took it apart and soldered the broken pins...found the fix by searching the forum. Nice and bright now

 

For MAP sensor, the hole in the LS3 intake is bigger than the LS1/6 and it's also a bolt down sensor. I used the LS6 sensor, wrapped a little bit of electric tape underneath the grommet then made a bracket out of some aluminum stock I had laying around to hold the sensor down. I bought a 3/4" bushing and cut it down to fit so the bolt couldn't be overtightened. Worked perfect.

 

Here's a video of the initial start. I put a quick tune in it to adjust the injector setting and cubic inch difference. It still needs to be tuned, but she's running!!

http://s102.photobucket.com/user/vor...D4C93.mp4.html

 

Nice job.

 

Couldn't watch the video on the link but I'll take your word for it Congrats.

 

Same here your video is private. I wanna see it. Congrats. 😎

 

Fantastic work! Pardon my ignorance, but how's the LS3 compare to the original LS6 power/torque wise? Would it be considered a significant upgrade over the original LS6?

 

Yes it's a significant upgrade. There's a lot more room for making power with the LS3 vs. LS6. More cubic inch and MUCH better cylinder heads. The LS6 is no slouch, but the LS3 is just better all around.

 

Try it now. Should be fixed

 

http://s102.photobucket.com/user/vor...D4C93.mp4.html

 

Sounds great man, besides the kooks headers, what other exhaust components do you have?

 

Kooks off-road x-pipe w/ factory Ti mufflers

 

Sounds great man and congrats on the swap!

 

Thanks!

 

That's great news cause that's gonna be my setup as well, hoping my car sounds very similar.

 

Now that I'm done, I figured I would summarize everything that needs to be done swap the LS3 into a C5. -LS3 engine, LS3 intake, fuel rails & injectors (obviously) -Swap over your LS1/LS6 oil pan & pickup to LS3 engine -Relocate knock sensors to side of LS3 block (drill and tap M10x1.5 thread) -Knock sensor relocation/extension harness (I used Racetronix) -Change the LS3's 58x reluctor wheel to 24x or use the Lingenfelter converter box (what I did). If changing the reluctor wheel you will need a cam sensor extension harness. If using the Lingenfelter box, the harness is not needed. -Relocate the LS1/LS6 MAP sensor to front of LS3 intake. The hole on the LS3 intake is slightly larger so wrap some electrical table under the LS1 MAP sensor grommet to make it larger and fit snug in the hole. The LS3 sensor is bolted down, so make a small bracket to hold your LS1/LS6 sensor down tight. -LS2 throttle body (silver blade) & adapter harness ( I used Racetronix) -Injector adapters (I used Racetronix) to run the LS3 style injectors with your factory harness (what I did) or use LS1 style injectors by changing lower O-rings and using spacers to bolt fuel rail down -Passenger side engine bracket needs to be modified to clear the a threaded boss on the LS3 block -Run vent from passenger side valve cover to intake tube (after MAF). I used a 3/8"x1/4" NPT 90 elbow and 3/8" hose -Reflash factory ECM for LS3 injector tables, more cubic inches, etc.
-LS1 pilot bearing must be used

Aside from that, everything else should work just like your LS1/LS6. All accessories, exhaust, etc. will bolt right up to the LS3. But while you have the engine out it's a good time to replace things like engine mounts, clutch, slave, starter, etc. if you need to.

 

I'm literally getting ready to embark on the same project, I logged on tonight for the sole reason to gain information on the LS3 swap and Boom - I found this thread. Great stuff - thanks man.

 

No problem. If you have any questions along the way, just let me know.

 

I just finished this swap myself! of course I went from a stock 220k LS1 to a L92/LS3, It is so much more fun to drive now!