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243 heads off new 5.3 / 4.8 engines, same as ls2 6.0 243?

This is a discussion on 243 heads off new 5.3 / 4.8 engines, same as ls2 6.0 243? within the Internal Engine forums, part of the LSx Technical Help Section category; i know that 2007+ 5.3 and 4.8 engines have the 243 casting heads on them from the factory. i know ...

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    Member jsmith564`'s Avatar
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    243 heads off new 5.3 / 4.8 engines, same as ls2 6.0 243?

    i know that 2007+ 5.3 and 4.8 engines have the 243 casting heads on them from the factory. i know the valves are not sodium or titanium, but what size? i don't know if they are the same 243 castings found on ls2 6.0's, or if the CC is the same size exc.. can anyone help with specifics? i'm having my ls1 replaced with an lq9 and planed on using the 317 heads but i can get a set of these heads from a friend cheap and just need to know if they are worth it over the 317's. help........

    so my question in short, are the 243's off newer 5.3's / 4.8's the same as the ls2 6.0 243's, if there are any differences what's different? and are they worth useing over the 317's for a NA motor?
    Last edited by jsmith564`; 08-18-2011 at 03:28 PM.

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    i did a search on here.. from what i gather they are pretty much the same head, is this correct?, sorry i posted this before i searched, at work i can't access the site and i for some reason forgot. but if anyone has any detailed information please post!!!!!!!!!!!!!!

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    Below is information i got from another forum. Anyone correct it if its wrong.

    853 and 241 are basically identical.

    853 was used on 99-00 LS1 engines.
    241 was used on 01-04 LS1 engines.
    They both have a 66.67 cc combustion chamber (10.1 CR), 200cc intake runners, and 70cc (round) exhaust ports.

    The 243 head is the 01+ LS6/LS2 head.
    It has a smaller 64.45cc chamber for more compression (10.5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports.

    All three came with 2.00" intake valves, and 1.55" exhaust valves.



    Of the three, the 243 (Z06) head is the most desirable for flow, and is the most popular base for further porting/modifying. Not many people mess with porting LS1 heads anymore.


    And FYI for the ones you didn't mention...


    5.3 truck heads (casting #862 and 706) are also a very popular base casting for porting/modifying, due to their even smaller (61.15cc) chamber size which raises compression when used on a LS1/6 engine..

    6.0 truck heads (casting #317) are popular heads with the forced induction crowd, as they are basically the same as 243 heads, but with larger 71.06cc chamber size, which lowers compression when used on a LS1/6 engine.
    Last edited by 1slowbusa; 08-18-2011 at 04:09 PM.

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    Member jsmith564`'s Avatar
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    thanks you for the info. i have searched to the best of my ability and from what i gather the 2007+ 5.3/4.8 243's are the same.

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    Member jsmith564`'s Avatar
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    if i may, i found some interesting information in this forum.. @@Look, ned help with 243 Head Questions@@ - Corvette Forum

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    Just remember real z06 heads have sodium filled valves.

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    Quote Originally Posted by 1slowbusa View Post
    Just remember real z06 heads have sodium filled valves.
    thats fine with me. i'm having a 6.0 lq9 installed and found a set of 243's off a newer engine and just wanted to make sure they will work.

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    if anyone is interested these are 243 and 799 castings off said 5.3/4.8 engines.....

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    yes the valves have rust. these came from flood engines. other wise these heads are in good shape.


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