LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Copper header gaskets...how do they go in?

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Old Mar 6, 2009 | 06:22 PM
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Default Copper header gaskets...how do they go in?

So I got some copper gaskets that will hopefully fix my leaky Percy's, but which way do they go in? They have the embossed ring around each port, but does the flat part go up against the header or the head?
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Old Mar 6, 2009 | 07:02 PM
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Originally Posted by DopdBrd
So I got some copper gaskets that will hopefully fix my leaky Percy's, but which way do they go in? They have the embossed ring around each port, but does the flat part go up against the header or the head?
That's a good question. I have copper gaskets as well, I really don't remember which way I put it on, but no leaks whatsoever.
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Old Mar 6, 2009 | 07:12 PM
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I'd put it toward the engine...
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Old Mar 6, 2009 | 07:17 PM
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Originally Posted by RamAir95TA
I'd put it toward the engine...
I honestly think that's what I did. Because I wasn't sure if the primary opening would seal on the raised ring of the gasket, but I knew it would seal on a flush surface like the head.
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Old Mar 6, 2009 | 08:30 PM
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I put the raised part toward the Header, I've never had a problem.
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Old Mar 6, 2009 | 08:41 PM
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I'd also put the raised toward the header, it's the only thing that makes sense. The heads are not perfectly flat of course, but they're much more so than the headers, unless you've purchased some quality ones that are CNCed flat.
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Old Mar 6, 2009 | 09:24 PM
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Originally Posted by Formula350
I'd also put the raised toward the header, it's the only thing that makes sense. The heads are not perfectly flat of course, but they're much more so than the headers, unless you've purchased some quality ones that are CNCed flat.
The correct term you're looking for is "milled," not CNC.

The cylinder head flange has a much better chance of being straight and true than certain headers.
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Old Mar 6, 2009 | 10:03 PM
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Originally Posted by RamAir95TA
The correct term you're looking for is "milled," not CNC.
Yes and no. There's manual and computer (CNC) mills. Now the Yes part is that Computer Numerical Control doesn't do the work, the mill does, and thus the header would be milled.

Sorry for assuming folks could make the connection :\
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Old Mar 6, 2009 | 10:05 PM
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Did you Google that all by yourself?
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Old Mar 6, 2009 | 10:07 PM
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Originally Posted by RamAir95TA
Did you Google that all by yourself?
Nope, I'm a big boy and learned it before our discussion! ^_^
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Old Mar 7, 2009 | 01:26 PM
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Ok well guess what they still ******* leaked. THen I thought what the hell and put my used Felpros back in....******* sealed right up.

I will never again use another gasket besides felpro. Endostory
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Old Mar 7, 2009 | 02:18 PM
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This just reminded me (which you're welcome to call BS on, but is the truth) that my friend had told me long ago when I was working at the parts store that the copper gaskets suck *** lol Hell, for cast iron heads and factory manifolds he doesn't even bother to use a gasket and yet they don't leak! Mind you this is GM V8s, doubtful it'd carry over to another manufacturer.
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