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Generation III Internal Engine 1997-2006 LS1 | LS6
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5.3 Valve seats???

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Old 03-01-2005, 06:04 PM
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Default 5.3 Valve seats???
How much can you machine out the stock valve seats on a 5.3 head before you have to install new seats????
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Old 03-01-2005, 06:51 PM
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2.04 is about as big as you can go with stock seats.
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Old 03-01-2005, 08:24 PM
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the 4.8L heads i had vinci port ended up with 2.02/1.60 valves in them using the stock seats.
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Old 03-01-2005, 08:51 PM
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2.04 on the intake and 1.585 on the exhaust.If you need custom valves I can get them for you.I prefer Manley valves.
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Old 03-01-2005, 09:18 PM
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I have also done a 2.02/1.6 on the stock 4.8/5.3 seats but for the money just stick with the stock exhaust valve.
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