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Number on Cylinder Head

This is a discussion on Number on Cylinder Head within the Internal Engine forums, part of the LSx Technical Help Section category; There is a number made into the driver side cylinder head right beside the powerstering fluid bottle. I was wondering ...

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    Member blk_jaws's Avatar
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    Number on Cylinder Head

    There is a number made into the driver side cylinder head right beside the powerstering fluid bottle. I was wondering what it stood for? Mine is 851

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    SLP LT's, SLP High Flow Cats, 3" Flowmaster CB, Comp Cam, SLP Lid, LS6 Intake, BBK 80mm TB, SFC, Ram Air HO Hood, Lowered, Torq Thrust II's

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    Simpsons Did it!! 98formy's Avatar
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    its simply the gm casting number for your set of heads, thats all.

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    Member blk_jaws's Avatar
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    Is that one of the numbers for stock heads?

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    Junior Member 346DubS6's Avatar
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    what were the differences in the heads between the years. Were there any heads that were better than the other? ?I have the 241 heads.

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    Member blk_jaws's Avatar
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    That is a good question, I'd like to know to. Does anyone have info on this?

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    Senior Member INMY01TA's Avatar
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    241/851=similar. 243=LS6 heads.

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    Member blk_jaws's Avatar
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    One more Q, do you know the compression ratio on 851 heads?

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    Senior Member mrr23's Avatar
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    never heard of an 851 head. for the f-body they only used 853. and that casting number was used on the 99-00 cars.

    here's some quick info
    http://smokemup.com/tech/ls1.php

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