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Generation III Internal Engine 1997-2006 LS1 | LS6
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Old Nov 16, 2004 | 07:31 PM
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Default 853's
are they beter than stock 98 heads.Got them off Ebay for $100.00.
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Old Nov 16, 2004 | 08:52 PM
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If so it is meaningless improvements. But they are a good base for porting.
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Old Nov 16, 2004 | 09:11 PM
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Originally Posted by slow98Z
are they beter than stock 98 heads.Got them off Ebay for $100.00.
according the book I have, the 853 was used from 97-00. So you may be replacing 853 heads with 853 heads...only difference being the valve cover bolt pattern
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Old Nov 16, 2004 | 09:16 PM
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853's are defiently earlier i believe 99-00 just took them off my car
thought 00's had better heads guess not , i never looked at the number till then
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Old Nov 16, 2004 | 10:32 PM
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Some of the '00 cars got the "better" 241 heads.
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Old Nov 17, 2004 | 05:44 PM
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98-99's got 801 heads. Don't know if they flow any different. Bolt patterns are different on 00-02 heads than 98-99 heads.
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Old Nov 17, 2004 | 06:44 PM
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Originally Posted by davered00ss
98-99's got 801 heads. Don't know if they flow any different. Bolt patterns are different on 00-02 heads than 98-99 heads.
????????

97 to 98 used the perimeter bolt valve cover and 99 and up used the center bolt valve cover. All the heads are interchangable on the block, just have to have the proper valve covers.

I believe the 243's started around mid 2000.
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Old Nov 17, 2004 | 10:08 PM
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Originally Posted by DaleMX
????????

97 to 98 used the perimeter bolt valve cover and 99 and up used the center bolt valve cover. All the heads are interchangable on the block, just have to have the proper valve covers.

I believe the 243's started around mid 2000.
243's are LS6 castings.
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Old Nov 18, 2004 | 11:51 PM
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i think i so an article in a magazine saing there is a difference in flow betuine years and heads!!!
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Old Nov 19, 2004 | 12:45 AM
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Originally Posted by fastsspr
i think i so an article in a magazine saing there is a difference in flow betuine years and heads!!!
In stock form, yes; but once ported they can all perform the same.
01/02 f-body 241 castings in stock form flow a little better than 853.
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Old Nov 19, 2004 | 03:14 AM
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Originally Posted by BlueSix
243's are LS6 castings.
Oh yea, meant 241's
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