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LS1 Block LS6 Heads

This is a discussion on LS1 Block LS6 Heads within the Internal Engine forums, part of the LSx Technical Help Section category; I have a 1998 Trans amm, with a 98 LS1 Engine. I want to put 01 Corvette LS6 Heads on ...

  1. #1
    11 Second Club 11.34 bigboykilroy's Avatar
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    1998 Firebird Trans AM

    LS1 Block LS6 Heads

    I have a 1998 Trans amm, with a 98 LS1 Engine. I want to put 01 Corvette LS6 Heads on the 98 block, This should bolt up no problem am I correct? If so What GM Head Gasket do I use when I put the engine back together the 98 or the 01 gasket? The only reason I ask it Summit Racings site says that the Gm Gaskets are for 99 and up.

    My Stock heads have a casting number of 806.

    I did find this: Are tey Talking about the heads or the engine block having a notch in it? (http://www.lingenfelter.com/store/ls1hgk03.html)

    Some early LS1 engines used cylinder head casting number #853, and #941 which has a notch in the deck and requires a different head gasket set.

    1997, 1998, and 1999 #853 and #941 Casting LS1 Kit includes everything you need to remove and replace your cylinder heads on your LS1 engine. There are some 853 casting numbers on 2000 vehicles, that may or may not have the notch. If it does not have the notch, you will need LS1HGK01. If you have any questions, please give us a call.
    Last edited by bigboykilroy; 01-06-2008 at 04:07 PM.

  2. #2
    Senior Member INMY01TA's Avatar
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    2001 Trans Am (sold)

    Not sure about the gaskets but I know you'll need 99' & up valve covers and coil packs as 98 are perimiter bolt and 99 up are center bolt.

  3. #3
    11 Second Club 11.34 bigboykilroy's Avatar
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    Quote Originally Posted by INMY01TA View Post
    Not sure about the gaskets but I know you'll need 99' & up valve covers and coil packs as 98 are perimiter bolt and 99 up are center bolt.
    That is correct. I have already purchased the 99+ valve covers and coil pack (s) and bracket (they came as a package deal)

    I'm just unsure of the GM Head gasket I should use.

  4. #4
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    2002 Trans am WS6 T-top

    The 97-98 head gaskets can be used on all Gen III engines. But the later model gaskets can not be used. The early model gasket has a cut out between 1 and 3 or 5and 7 on the lower edge, which will cause a coolant leak. Basicly you will need the gasket for the head you will be installing.
    Check out Texas-speed inc on this. I have a set on new .040 cometic gaskets if you need them, p#C5475-040(3.910 bore) for 125 shipped . Just make sure the head is surfaced for them 50RA or smoother.

  5. #5
    11 Second Club 11.34 bigboykilroy's Avatar
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    The Heads I just got are 01 vette 243 heads.

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