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Old 01-29-2011, 08:51 AM
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cast iron valve sighns

i pulled off my cast iron heads and put on some eddy heads and noticed a few of the exhaust valves were white looking and some were darker colored? the last time i was running it i had it idling for about 20 minutes while i was bleeding the brakes. what would cause this? if its spark related, would a msd or equivallent box help?

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Old 01-29-2011, 08:56 AM
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Sounds like too lean air / fuel mixture.
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Old 01-29-2011, 09:10 AM
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would the the lean mixture be on all the valves? whats another tell tale sign of running lean if you cant inspect the valves?
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Old 01-29-2011, 01:21 PM
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The spark plugs, white is too lean, tan is good, black is too rich. Google it, you'll find lots of info on reading plugs.
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Old 01-29-2011, 03:31 PM
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Quote:
Originally Posted by 327NUT
The spark plugs, white is too lean, tan is good, black is too rich. Google it, you'll find lots of info on reading plugs.
You can't get plug readings off idle. Best bet is WOT, immediatly shut off, coast to a stop and pull 'em. Rich or lean at idle and cruise or WOT are two different issues.
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Old 01-30-2011, 12:05 AM
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Brand new/rebuilt fuel injection engine exhaust valves are usually very close in color but once they are used and have a few miles on them they turn different colors too, I wouldn't worry about it...you can't tell much about an engine by looking at exhaust valve carbon deposit colors unless its burning oil.

Too many variables.
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