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Generation III Internal Engine 1997-2006 LS1 | LS6
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4in bore heads on a 3.9 bore shortblock???

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Old 12-13-2005, 09:30 PM
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pdd
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Default 4in bore heads on a 3.9 bore shortblock???
can you use 4.0 bore heads on a 3.9 bore? whats the cons to this?
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Old 12-13-2005, 11:19 PM
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People use the 4.125 AFR 225's on 346's, so i don't see why not.
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Old 12-13-2005, 11:57 PM
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Make sure the valves aren't being shrouded by the smaller bore.
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