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Thread: 243 LS heads - fully assembled

  1. #1
    Join Date
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    243 LS heads - fully assembled

    I have a set of 243 casting number LS style cylinder heads for sale. They are stock and unmolested, in perfect condition. The heads are fully assembled with stock valves and valve springs and they are ready to drop on a motor today.

    I need $500.

    Call or text me at 918-3four6-87zero6


  2. #2
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    6.0 or 5.7 heads?

  3. #3
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    They were aluminum 5.3 heads. What engine size they came off of doesn't matter. All that matters is the year they were made. Some early ones had probs with the casting process or some shiz. These should be good.

  4. #4
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    Quote Originally Posted by AFSP1211 View Post
    They were aluminum 5.3 heads. What engine size they came off of doesn't matter. All that matters is the year they were made. Some early ones had probs with the casting process or some shiz. These should be good.
    Yes yes yes. Thanks bud.

  5. #5
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    Quote Originally Posted by AFSP1211 View Post
    They were aluminum 5.3 heads. What engine size they came off of doesn't matter. All that matters is the year they were made. Some early ones had probs with the casting process or some shiz. These should be good.
    Not totally true...if they came off an 6.0 ls2 and are stock they would have the sodium filled valves so yes it does matter.
    T-RAV
    99 GMC | 5.3 | Skinny White Guy Tuned

  6. #6
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    Quote Originally Posted by bangbangskeetskeet View Post
    Not totally true...if they came off an 6.0 ls2 and are stock they would have the sodium filled valves so yes it does matter.
    He's talking about the casting, boss. But yes...

  7. #7
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    6.0, 5.3, 5.7 have diff combustion chamber sizes. If u put 6.0 heads on a 5.3 u will loose compression

  8. #8
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    Quote Originally Posted by bootlife View Post
    If u put 6.0 heads on a 5.3 u will loose compression
    Are you sure. Surely a larger cumbustion chamber wouldn't drop compression..... Bump for a good seller and thread crappers
    Slowest in Oklahoma...

  9. #9
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    Quote Originally Posted by bootlife View Post
    6.0, 5.3, 5.7 have diff combustion chamber sizes. If u put 6.0 heads on a 5.3 u will loose compression
    Not if they're all the same casting number. 799/243's are the same no matter what engine they come off of. 5.3, 5.7, 6.0 have all used 243/799 heads at some point, and they're all the same.
    2006 Silverado
    Little Black Bitch

  10. #10
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    Quote Originally Posted by ecld_07 View Post
    Are you sure. Surely a larger cumbustion chamber wouldn't drop compression..... Bump for a good seller and thread crappers
    Quote Originally Posted by Frenchy View Post
    Not if they're all the same casting number. 799/243's are the same no matter what engine they come off of. 5.3, 5.7, 6.0 have all used 243/799 heads at some point, and they're all the same.
    Thanks guys...

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