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823 Heads onto a Ls1

Generation III Internal Engine 1997-2006 LS1 | LS6

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823 Heads onto a Ls1

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Old

Sep 5, 2025 | 04:15 PM

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From: Nz

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823 Heads onto a Ls1

Hey Team, I’ve just acquired a set of very low mileage 823 heads off of a L77, I’ve got a higher km large canmed Ls1 in my statesman, is it worth while swapping the heads etc out? (I’ve got a Ls3 intake manifold etc all sitting there ready to go aswell)

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Sep 5, 2025 | 04:37 PM

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From: Ft Lupton, CO

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Quote:

Originally Posted by Ls3swappedHQ

Hey Team, I’ve just acquired a set of very low mileage 823 heads off of a L77, I’ve got a higher km large canmed Ls1 in my statesman, is it worth while swapping the heads etc out? (I’ve got a Ls3 intake manifold etc all sitting there ready to go aswell)

823 heads will not fit an ls1. The bore is too small and the valves will hit.

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Sep 5, 2025 | 08:00 PM

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Has to be at least a 6.0 block for the 823's to work.

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Sep 5, 2025 | 08:28 PM

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From: The Beach...

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Minimum 4.000" Bore, 2007 info..

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