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Old 03-05-2016, 9:39pm   #1
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Default Opinion on rebuild/replace
My Z has 167000 miles on it. Starting to think about rebuilding/replacing the engine.

Thoughts/opinions on both, please? What and why...
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Old 03-06-2016, 8:05pm   #2
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If it aint broke, don't fix it. Words to live by.
Why are you thinking about it?
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Old 03-06-2016, 9:00pm   #3
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I like plans... AS it gets up there in mileage, I want to have a plan.
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Old 03-07-2016, 7:26am   #4
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What kind of HP do you want? LS3 conversion seems the most practical, and if you want to buy a new one, 2 year warranty for about $6K.
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Old 03-08-2016, 7:09am   #5
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Originally Posted by RonC5 View Post
What kind of HP do you want? LS3 conversion seems the most practical, and if you want to buy a new one, 2 year warranty for about $6K.
I love the sound of this, but not sure what the complications of this would be? It's actually much easier to find a LS3 than a LS6 for some reason.
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Old 03-08-2016, 10:15am   #6
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Seems to be a fairly common upgrade. Here is a thread at Lingenfelter that list parts used.

2004 Corvette LS1 to LS3 swap
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Old 03-08-2016, 8:45pm   #7
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It's pretty much a drop and swap. Have to change a couple things for the throttle body I believe, and that's about it.
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Old 03-08-2016, 9:53pm   #8
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Anyone venture a guess at why it's difficult to find LS6's?
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Old 03-09-2016, 12:10am   #9
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Supply/demand?

Other than a purist who insists on keeping things absolutely stock, I cannot think of a reason to choose LS6 over LS3.

GM probably prefers to taper off production of the old Gen3 engine as well. And they can influence the exact buying decision you're making by pricing and availability.
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Old 04-15-2016, 4:29pm   #10
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Chevrolet Performance 19301326, Chevrolet Performance LS3 6.2L 430HP Engine | Chevrolet Performance
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Old 04-20-2016, 6:15pm   #11
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Swap out and you'll have LS6 block to sell, build, etc. Mine [LS3] is .8 sec. and 4 mph faster in the 1/4 than the black Z
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