L76 to LS3 - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 5 (permalink) Old 05-06-2019, 10:40 PM Thread Starter
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L76 to LS3

I have a 2009 G8 GT Auto and am wanting to know if anyone has bought an crate LS3 and installed it? do they directly hook up electronically?? What mods must i make if any other than a good tune? Thanks John

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post #2 of 5 (permalink) Old 05-07-2019, 08:47 AM
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Pretty sure this has been done a number of times, and as far as I know everything is electronic the same except for the DOD plug, but that will just stay unplugged.

Here are a couple physical differences.
- PCV system is slightly different. L76 outlet is on the back of the drivers side valve cover. LS3 comes out of the valley cover, near the passenger side of the throttle body. easy change over.
- water pump is different, need a GXP upper radiator hose

All that said. Why buy a crate engine? Quite expensive compared to redoing the L76.

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post #3 of 5 (permalink) Old 05-07-2019, 09:11 AM
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Originally Posted by ebg8gt View Post
All that said. Why buy a crate engine? Quite expensive compared to redoing the L76.
Or getting an LS3 from any number of wrecked vehicles.

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post #4 of 5 (permalink) Old 05-07-2019, 10:18 AM
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post #5 of 5 (permalink) Old 05-14-2019, 04:06 PM
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I did an ls7 and it was a pretty easy swap.
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