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Generation III Internal Engine 1997-2006 LS1 | LS6
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774 LS1 Heads? Prototype Heads?

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Old 08-06-2017, 08:00 AM
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Default 774 LS1 Heads? Prototype Heads?
Saw LS heads with a 774 casting number, has anyone heard of this? Saw stamp marks of WC and SER stamped on both heads also
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Old 08-06-2017, 08:31 AM
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Never heard of it. Where did you see them?
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Old 08-06-2017, 10:59 PM
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Was told it was out of a GTO but was mounted on a 5.3L block. Nothing anywhere of this casting number existing, kind of curious
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Old 08-06-2017, 11:11 PM
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Possibly a effed up 799 number??
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Old 08-07-2017, 08:27 PM
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No sign of marring or blemishes so I would say that is original
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Old 08-07-2017, 08:34 PM
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96/97 early ls head, preproduction.
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Old 08-07-2017, 08:55 PM
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Do they use perimeter bolt valve covers?
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Old 08-07-2017, 09:02 PM
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There are 4 bolts in the center and threaded holes for the coil packs
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Old 08-08-2017, 06:06 AM
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What size are the valves? Could they be some HOLDEN derivative?
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Old 08-08-2017, 06:44 AM
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https://ls1tech.com/forums/generatio...ing-554-a.html

https://ls1tech.com/forums/generatio...sting-ls1.html

https://ls1tech.com/forums/generatio...-code-ls1.html
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Old 08-08-2017, 11:20 PM
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Should clean the heads up and send them to Barrett Jackson or Mecum. Cha ching
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Old 08-09-2017, 12:20 AM
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This might be the only time all of Ls1tech cries out in one voice - DONT MODIFY THOSE HEADS! Lol
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