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Generation III Internal Engine 1997-2006 LS1 | LS6
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Head casting numbers

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Old 01-13-2005, 03:46 PM
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Default Head casting numbers
How important is it to match the casting number when buying used heads?
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Old 01-13-2005, 04:06 PM
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Very. You need to stick to one casting number. If you have a 853 head and a 241 head the 241 side would flow more air.
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Old 01-13-2005, 04:26 PM
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Oops I just read what I wrote, I mean if I'm replacing the stock 241 heads I have with a set of 853 heads is that ok? I'm having them ported
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Old 01-13-2005, 04:27 PM
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Yaa that is ok.
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