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Generation III Internal Engine 1997-2006 LS1 | LS6
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older heads on my 02 trans am

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Old 02-26-2012, 09:53 AM
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Default older heads on my 02 trans am
i recently got a set of SLP ported 806 heads with decent numbers for a good price i have bolted them on my car and was told the 02 head gasket was not compatible with these heads and they will leak coolant is this true. if it is what gaskets do i need to run
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Old 02-26-2012, 12:33 PM
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I believe the '98 ls1 heads require a year specific head market. So, if they are '98 they're you would need a '98 ls1 head market.
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Old 02-26-2012, 01:02 PM
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Yes. 806's and some 853's have a notch in the deck that will leak if used with MLS gaskets. You need to use the thick composite gasket
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Old 02-26-2012, 01:10 PM
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Well that sucks just wasted time and money
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Old 02-26-2012, 01:15 PM
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Thanks for the info guys so I should just order 1998 specific head gaskets
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Old 02-26-2012, 02:36 PM
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Yup and mill the heads to get your desired compression!!!
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Old 02-26-2012, 04:57 PM
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Were is this notch at?
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