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Cylinder Head Question

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Old Feb 23, 2009 | 05:56 PM
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Default Cylinder Head Question
What's that black stuff:

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Old Feb 23, 2009 | 06:40 PM
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What kind of head? Ported stock or aftermarket?
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Old Feb 23, 2009 | 08:14 PM
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ported LS6
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Old Feb 23, 2009 | 08:21 PM
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It could be an indicator like Prussian Blue - except black - left behind after porting or it could be areas untouched by the CNC bit.

BTW: Curious, who did those heads?
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Old Feb 23, 2009 | 08:44 PM
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dunno! found the image on a google search!

b/c i was too lazy to take a pic of mine and upload it

Mine are ported 799's from PRC and have the same exact look.
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Old Feb 24, 2009 | 10:40 AM
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It looks like they were overported and actually broke into the water jacket, the black stuff would be filler.
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Old Feb 24, 2009 | 10:49 AM
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Could either be die or could be epoxy from filling a hole or low spot. Or just bare head like Charlie said.
Last edited by Anthony @ LGMotorsports; Feb 24, 2009 at 11:23 AM.
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Old Feb 24, 2009 | 11:01 AM
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Originally Posted by ALVETTE00
What's that black stuff:

That is the original casting not cleaned up by the CNC porting.
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Old Feb 24, 2009 | 11:14 AM
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Internet guess work is sometimes fun, but could be way off base from what the photo is really about. My guess, this could have been a sacrificial head used on a flow bench testing to develop the CNC paths. Not something I would want on my daily driver.

Hey, just my guess…..
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Old Feb 24, 2009 | 01:55 PM
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Originally Posted by C_Williams@RPM
That is the original casting not cleaned up by the CNC porting.
This is it. My TEA heads had a tad of this. Nothing to worry about.
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