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View Full Version : L76 to Ls3 replacement--- what is needed to accomplish?


gr8lover
04-30-2014, 10:29 AM
Looking to help someone out with some info relating to what is required to replace a L76 with a Ls3?...


Does the engine harness have to be changed out?
Tune and programming? What needs to be done?... BCM, ECM?
Other modifications required?...

Thanks for any help!!!!
gr8lover
04-30-2014, 11:18 AM
Looks like there is another thread on this I didnt see ..... I will be looking thru that thread... but if you happen to have done this , I would love to hear your suggestions or anything learned from doing this.... thanks much...

looks like all you need is two hoses for the water pump... #92215927 and #92261483 and thats it unless I am missing soemthing?..... obviously it needs to be put the tune and program in ....

anything else required?....

thanks
Greg@PacePerformance
04-30-2014, 11:53 AM
You might have to use the stock TB if the G8 isn't a 2009.5
other than that it should just be some tuning needed.
-Ray-
04-30-2014, 03:11 PM
There may be two places for the oil dip stick. One in the back will need to be blocked if it was drilled out.
Greg@PacePerformance
05-01-2014, 06:25 AM
There may be two places for the oil dip stick. One in the back will need to be blocked if it was drilled out.

The new LS3 would come with the 2009.5 oil pan w/o the dipstick hole in the pan so there will not be two holes.
-Ray-
05-01-2014, 12:14 PM
Yeah, for some reason I was thinking short block.
Greg@PacePerformance
05-01-2014, 12:24 PM
Well if that was the case there might be an issue there :)
I think in complete engines and long blocks lol
Frostopsy
05-01-2014, 12:47 PM
Why an LS3 and not a stroker? That's a lot of work for just a little more displacement


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gr8lover
05-01-2014, 09:09 PM
Why an LS3 and not a stroker? That's a lot of work for just a little more displacement


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Not if the Ls3 is free... :)
STL_G8GT
05-02-2014, 06:36 AM
Not if the Ls3 is free... :)

Fell off a truck like those guys in AUS a whole back? ;)
hulkss
05-02-2014, 09:10 AM
You might have to use the stock TB if the G8 isn't a 2009.5
other than that it should just be some tuning needed.

Yes, the throttle body has to be swapped from the L76 to the LS3. The E38 operating system for the L76 was designed to work with the older "silver blade" throttle body, while the crate motor needs a newer E38 OS designed to work with the newer "brass blade" throttle body. Both throttle bodies are the same size so no issues there. If you have a 2009.5 you should be OK with the new throttle body.
gr8lover
05-02-2014, 02:17 PM
Fell off a truck like those guys in AUS a whole back? ;)

sort of the same situation me and you had... :)
BuildItYourSelf
05-02-2014, 05:49 PM
the oil pressure sensor needs swapped right? Not sure. I think its a different plug.
Greg would know. I swapped mine when I did the harness think it was BC of the plug.

Edit. I had a brain fart.
Frostopsy
05-03-2014, 07:49 AM
Not if the Ls3 is free... :)

Well hell, why didn't you say so? That's a great swap!


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SpaceFrank
05-12-2014, 04:11 PM
I have a set of Kooks headers on my recently deceased L76. I assume they would swap over to an LS3. Does anyone know if they would interfere with the new dipstick location?
Crazy Paul
05-12-2014, 04:20 PM
I have a set of Kooks headers on my recently deceased L76. I assume they would swap over to an LS3. Does anyone know if they would interfere with the new dipstick location?
Yes, headers will swap over.
If anything interferes then you just use your original oilpan, pickup tube, dipstick etc.