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How to tell what year the engine is?

This is a discussion on How to tell what year the engine is? within the Internal Engine forums, part of the LSx Technical Help Section category; how would I tell for sure its a 99. It says on paper its a 99 but if what ive ...

  1. #1
    Senior Member Justin23454's Avatar
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    1998 Trans Am

    How to tell what year the engine is?

    how would I tell for sure its a 99. It says on paper its a 99 but if what ive been reading is true and 99s dont have perimeter bolt style valve covers then they fucked me over...

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    Member xmarkx's Avatar
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    black
    1999 camaro SS

    it could be a block from a 99.... with 853 heads which came stock on 98's

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    Visualize°Design°Create SSwt00SS's Avatar
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    '12 Silver SS 1SS
    '00 Black SS #8617

    '98 year cars only had perimeter bolt valve covers, from what i have read. they switched to center bolt covers in '99+

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    Senior Member Justin23454's Avatar
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    ok, so they sent me a 98 and not a 99. Thanks

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    Senior Member Justin23454's Avatar
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    Quote Originally Posted by xmarkx View Post
    it could be a block from a 99.... with 853 heads which came stock on 98's
    why would they swap that :O

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    Member xmarkx's Avatar
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    black
    1999 camaro SS

    who knows? maybe they had a block available but it was without heads so they reused your original heads

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    Visualize°Design°Create SSwt00SS's Avatar
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    '12 Silver SS 1SS
    '00 Black SS #8617

    pull the number off the back side of the block and run it. that way you know for sure.

    i have a stock '98 TA Ws6 that the older guy i bought it from, he said was stock. however, it has 241 heads. also, my 2000 SS when i looked at the heads were also 241 heads. unless my 2000 SS was produced late in 2000, it should have come with 853 heads i thought (center bolt design). im not complaining, but i understand how questions come about.

    im currently working on the TA and will be pulling the motor. ill run the block from there and see what the whole story is. there really is no difference between a '98 and '99 except for the valve covers

    anyone can correct me, but this is what i thought the head breakdown was:

    '98-'00 = 853 heads
    '01-'02 = 241 heads

    i have heard that some '98 had 806 heads. i cant confirm this though.
    Last edited by SSwt00SS; 10-22-2010 at 10:23 AM.

  8. #8
    Quote Originally Posted by SSwt00SS View Post
    anyone can correct me, but this is what i thought the head breakdown was:

    '98-'00 = 853 heads
    '01-'02 = 241 heads
    853 casting: 98-00
    241 casting: 00-02

    The switch from the 853 perimeter to 241 centerbolt happened mid-year. Some original perimeter bolt cars had engine service under warranty, and the only service replacements may have been 241 castings.

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    Visualize°Design°Create SSwt00SS's Avatar
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    '12 Silver SS 1SS
    '00 Black SS #8617

    thanks. i was wondering if they changed mid/late year in 2000, apparently so. thanks for confirming!

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    Senior Member Justin23454's Avatar
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    Quote Originally Posted by SSwt00SS View Post
    pull the number off the back side of the block and run it. that way you know for sure.

    i have a stock '98 TA Ws6 that the older guy i bought it from, he said was stock. however, it has 241 heads. also, my 2000 SS when i looked at the heads were also 241 heads. unless my 2000 SS was produced late in 2000, it should have come with 853 heads i thought (center bolt design). im not complaining, but i understand how questions come about.

    im currently working on the TA and will be pulling the motor. ill run the block from there and see what the whole story is. there really is no difference between a '98 and '99 except for the valve covers

    anyone can correct me, but this is what i thought the head breakdown was:

    '98-'00 = 853 heads
    '01-'02 = 241 heads

    i have heard that some '98 had 806 heads. i cant confirm this though.
    ok so if I have 241 heads on my old engine, can I just swap them out onto my new engine? And if so what if anything do I need to do to make it work?
    Also what is the diff in the 241 head and 853 performance wise or how was the heads improved?

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    Visualize°Design°Create SSwt00SS's Avatar
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    '12 Silver SS 1SS
    '00 Black SS #8617

    that is correct. you shouldn't have to do anything. plug and play. just need to use new head gaskets.

    i cannot tell you what the difference is between the 853's and the 241's, performance wise. i don't think there's anything, but someone else will have to answer that.

  12. #12
    Senior Member Justin23454's Avatar
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    last question is there a diff. between the 806 and 241? Because ive got the 806 on my new engine.

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Justin23454 View Post
    Also what is the diff in the 241 head and 853 performance wise or how was the heads improved?

    The 241 heads went through a different casting process (sand casting??) I forget what it was called. In any event, this provided more consistent dimensions from port to port and also provided a smoother finish.

    In the end the 241's had slightly higher flow bench numbers compared to the earlier heads. I have a flow sheet around here comparing them. I want to say there was a difference of 5-10 cfm peak flow between the two.

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