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LS1 head castings

This is a discussion on LS1 head castings within the Internal Engine forums, part of the LSx Technical Help Section category; Can anyone tell me if heads with a casting # of 799 will directly replace heads with a #241 casting?...

  1. #1
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    Question LS1 head castings

    Can anyone tell me if heads with a casting # of 799 will directly replace heads with a #241 casting?

  2. #2
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    2000 TransAm WS6

    Yes, I have a truck with those heads and they came on HO 5.3L trucks, I dont know about the vavle size, the trucks normally have smaller vavles
    Mike Berry
    2000 TransAm WS6 A4
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  3. #3
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    Like said above they'll bolt on but the truck heads have smaller valves and a smaller combustion chamber.
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    What will that do for my performance?

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    My LS6 Stage 2.5 heads from Texas Speed and Performance, are 799's. they are great performers and I still need to get my car properly tuned.
    Check the link:


  6. #6
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    Quote Originally Posted by Zoilus View Post
    My LS6 Stage 2.5 heads from Texas Speed and Performance, are 799's. they are great performers and I still need to get my car properly tuned.
    Check the link:

    Click for full size
    yea they're supposed to be just like the LS6 except with smaller vavles from GM but you have a port and vavle work then there would be no difference

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