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Generation III Internal Engine 1997-2006 LS1 | LS6
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will ls1 head fit 5.3 block?

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Old 01-19-2008, 08:25 AM
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Default will ls1 head fit 5.3 block?
i konw 5.3 head fits 5.7 but does 5.7 fit 5.3?
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Old 01-19-2008, 09:46 AM
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Default 5.3?
Yes the should work just fine. All the LS based engines parts are pretty much enterchangable except for the LS7.
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Old 01-19-2008, 11:34 PM
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yup. it should work no problem.
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Old 01-20-2008, 09:09 AM
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keep the 5.3 heads,the smaller bore shrouds the valves too much in the 5.7 heads,not only that you lose compression
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Old 02-11-2008, 07:07 PM
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yeah dont ditch the 5.3l heads....the ls1 heads on the 5.3l block will hurt you in performance unless your going to supercharge it or do anything else to up the compression.
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