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white valve others black

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Old Jul 19, 2011 | 10:52 PM
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camarotucker
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From: Lawrence KS
Car: 91 z28
Engine: LS1
Transmission: 4L60e
Axle/Gears: 10 bolt 3.42
white valve others black
I took the head of a dying engine, all the valves are black but one is white what does this indicate? Former nitrous engine.
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