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can the head surface be to smooth?

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Old Feb 27, 2009 | 09:44 AM
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quick346's Avatar
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Default can the head surface be to smooth?

I want to cut my afr's a little more and our bridgeports at work are old as hell

and if i want to use the cnc's my boss will prob charge me machine time around $90 a hr so that is out

so i want to set them up in the wet grinder and just grind off the .015 i want to take off them

but will that be too smooth for the gasket to seal? i run cometics and i think the smoother the better with them just wondering what the thoughts are on this

thanks
mike
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Old Feb 27, 2009 | 09:54 AM
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there is no such thing as too smooth. its the imperfections like scratches or gouges that create the leaks.
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Old Feb 27, 2009 | 10:18 AM
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You want to run between 20-30 RA (Cometic requires a finish better than 50 RA)

Shane
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Old Feb 27, 2009 | 11:17 AM
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Talk to Cometic directly. Flatness is as important, I think it is 0.001 runout over the width and slightly more over the length. My AR's had 0.0005 over the length.
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Old Feb 27, 2009 | 12:06 PM
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ok thanks guy's. a guy at work told me that if it was too smooth the gasket would not hold onto the head and push out.

kind of made sense but really i can't see that happening i think the main cause of failure would be from imperfections on the surface causing a leak .

off to the grinder they go
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Old Feb 27, 2009 | 04:49 PM
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I believe cometic specifies not to cut them too fine, check their website.
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Old Feb 27, 2009 | 06:22 PM
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its going to have to be done correctly for the cometics to seal up.
good advice from shane above.

i worked my setup around a stock head gasket, because i didnt want any issues.
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