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Generation III Internal Engine 1997-2006 LS1 | LS6
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head gasket sealing issue

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Old Nov 16, 2013 | 05:11 PM
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Default head gasket sealing issue
New gm mls gaskets with arp head bolts. Driver side is sealed good but passenger side is leaking. Its dripping out toward the header. I gotta pull it apart and see what's up. Does anyone have suggestions on anything to help the seal?
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Old Nov 16, 2013 | 06:36 PM
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More info...
which block (new, old)...?
which heads (new, old, milled)...?
did you check the block and heads for flatness...?
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Old Nov 16, 2013 | 06:43 PM
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Stock ls1 block and heads. Did not check for flatness. Cleaned block and heads very well. 853 heads.
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Old Nov 17, 2013 | 01:53 AM
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Originally Posted by Slimsilverado
Stock ls1 block and heads. Did not check for flatness. Cleaned block and heads very well. 853 heads.
High mileage heads?

You can always pull them (head gaskets) off and coat them with permatex copper spray..

But it's possible the heads are not 100% flat if they have a lot of miles
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Old Nov 17, 2013 | 11:01 AM
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Originally Posted by Slimsilverado
Stock ls1 block and heads. Did not check for flatness. Cleaned block and heads very well. 853 heads.
Did you use MLS or Graphite Gaskets???

If you used MLS I bet the 853 head has a notch cast into it. If it does have a notch cast into it then you need to use Graphite Gaskets.


Some of the Gen 3 heads from 99-01 had a notch cast into them and require the use of the Graphite gasket. The MLS gasket will not seal on these heads. They will leak as soon as you fill them up.
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Old Nov 17, 2013 | 11:46 AM
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Yes he's using gm mls gaskets!
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Old Nov 17, 2013 | 12:25 PM
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This thread shows the notch I am referring to.

http://www.performancetrucks.net/for...5/#post5163178
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