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Used LS1 advice needed!

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Old 12-13-2006, 07:31 AM
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Default Used LS1 advice needed!

I need some advice,

I found an LS1 engine locally for $350, advertised from private seller as

ALUM BLOCK, ALUM HEADS, COMPLETE ENG CORE
I asked what all was included and where it came from and this is his response.

I have had the core for awhile i got bought it from a guy that worked at a gm dealership . its a warranty engine that smokes . if u want i will pull the heads off 4 u. As
it sits now it has oil pan block crankshaft piston con rods timing cover heads vavle train and vavle covers
Does this sound like something good to work up a 383 from or could there be issues with the engine block? $350?

Thanks, Bill.
Old 12-13-2006, 07:41 AM
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Any chance you can go and check it out? Having the heads off will give you a good chance to see the bore and combustion chamber.
Old 12-13-2006, 07:52 AM
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He offers to pull the heads but frankly I'm not certain I could identify an issue unless it was obvious. What should i be looking for?
Old 12-13-2006, 08:18 AM
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To me, it sounds like a bad oil ring. Yeah, check the cylinder walls.
Old 12-13-2006, 09:45 AM
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Porbably the most inportant thing is the cylinder walls. Take a flash light to them and make sure they are not scored. If they are, you would have to have them sleeved which is a lot of money. Not sure if it would be worth it. I think if you were to go with a 383, you go with new pistons and rods, so I would not be as worried about those.
Old 12-13-2006, 09:52 AM
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So if they are not gouged it's cool? How deep if at all can a scratch be? up to .003" So like a fingernail should not be able to sop on it? I would have them honed anyway. and all new internals, of course.
Is $350 about right, cheap for a good ls1 block?
Old 12-13-2006, 11:58 AM
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Originally Posted by trever1t
So if they are not gouged it's cool? How deep if at all can a scratch be? up to .003" So like a fingernail should not be able to sop on it? I would have them honed anyway. and all new internals, of course.
Is $350 about right, cheap for a good ls1 block?
there shouldn't be any scratches at all, if there are they must be shallow enough to bore out.
Old 12-13-2006, 01:03 PM
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What year LS1? Early 98-00' you could only hone the cylinders about .002" because the cylinder sleeves were very thin. The later years had a little thicker sleeve that you could bore I believe .010"
Old 12-13-2006, 01:07 PM
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That was my next question. Does year matter for a build or not? How can I identify a mfg year, any codes?
I just talked with him and he's going to pull the heads so I can see it Saturday.
$350 sounds like a deal, the heads alone are worth $200, right?
Old 12-13-2006, 01:12 PM
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If the heads are the factory ones, I know the earliers years had primeter bolts for the valve cover and the later ones had center bolts.


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