Exhaust valve colors

Aug 21, 2015 | 04:30 PM

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From: Kaneohe, HI

Exhaust valve colors

Trying to figure out what exhaust valve color means, take a look!!!

Head from LS1 99 Vette #853

Head from 5.3 truck #706

Aug 22, 2015 | 02:47 AM

TECH Senior Member

Joined: Apr 2002

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From: So.Cal.

Exhaust valve colors

My guessimate is that the manganese/MMT in octane booster has precipitated and/or oxidized out onto the hottest surfaces (the exhaust valves).

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