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Generation III Internal Engine 1997-2006 LS1 | LS6
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size intake valve

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Old 12-02-2003, 04:34 PM
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Default size intake valve
what is the stock size of the intake valve?
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Old 12-02-2003, 05:05 PM
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Not 100%, but I think it's 2.00".
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Old 12-02-2003, 08:18 PM
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2.00 is correct. 1.55 exhaust valve.
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Old 12-02-2003, 10:06 PM
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Originally Posted by Jason99T/A
2.00 is correct. 1.55 exhaust valve.
yup. tonight i my friend pulled his stock 5.0 heads and it was funny how small the valves were 1.78/1.4x . there was also a quarter size hole in his piston
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Old 12-03-2003, 01:00 AM
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Our stock pistons are pretty weak too... detonation will kill them quick.

1.78 valves is SMALL, then again, it's only got to feed a 5.0 liter motor.
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