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Thinking of buying an LS3

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Old Oct 25, 2011 | 11:16 PM
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From: PRince George, VA
Question Thinking of buying an LS3

I found a used LS3 I am interested in buying. It has a small cam and upgraded valve springs. The motor has 19k miles. The owner did a compression test on it today and the average number was 175psi. 180psi being the highest. But cylinder #5 was at 170psi. Should this be something I should be concerned with or is this not a big of a difference to cause any damage down the road?
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Old Oct 25, 2011 | 11:43 PM
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what was the psi on cylinder #3 and #7? or better yet post em all if you remember. I think they have to be within 10% of each other if i remember correctly. So it seems fine if theyre all within range.

wheres the ls3 going in?
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Old Oct 25, 2011 | 11:47 PM
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Originally Posted by Zlow28
what was the psi on cylinder #3 and #7? or better yet post em all if you remember. I think they have to be within 10% of each other if i remember correctly. So it seems fine if theyre all within range.

wheres the ls3 going in?
Not sure which all the numbers are but I can post them tomorrow. I wasn't able to talk to the owner today but he left me a message this morning. This is going in my 2001 corvette.

I remember him saying that it was a 6% difference of what 5% is acceptable. So it was a little out of range. All 7 other cylinders were 175-180 but #5 was the lowest at 170.
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Old Oct 26, 2011 | 02:43 PM
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I agree get all the numbers to see the exact percent. Doesnt sound horrible, was he hand cranking the engine or was it in a car?, Could make the difference.
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Old Oct 26, 2011 | 03:46 PM
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It is in the car
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Old Oct 26, 2011 | 11:33 PM
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I have an LS3 out of my 2011 Camaro that I am selling....it only has about 3k miles on it. It is at Vengeance Racing in Atlanta. You can call em and ask them about any details but it has a Stage II cam in it and upgraded valve train as well as Melling oil pump and Katech timing chain. I would estimate about 500 hp at the flywheel with a set of headers and a tune.

Vengeance's phone number is 678-513-7105 and you can speak with Kevin or Ron.
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Old Oct 27, 2011 | 01:12 AM
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