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Generation III Internal Engine 1997-2006 LS1 | LS6
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Will they fit?

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Old 07-09-2016, 12:18 PM
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Default Will they fit?
Can I use 823 square port heads on the 5.7L block?
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Old 07-09-2016, 07:27 PM
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In a word. Nope. Bore too small for those valve sizes
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Old 07-09-2016, 07:29 PM
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I didn't think that they would. To my understanding anything square port has to be on 4" or bigger bore. Anything cathedral port will fit any LS engine.
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