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Author
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Topic: 351C copper head gaskets......
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'69Stang
Gearhead Posts: 205
From: Detroit, MI USA
Registered: Jan 2002
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posted 06-04-2003 10:50 AM
   
Due to an o-ring issue with my heads I have to run copper gaskets. The guy I bought my heads from put a copper o-ring in the heads and unfortunately one of the O-rings lies outside of the compression ring on the Fel-Pro gaskets, it compresses in the cardboard material of the gasket. Anyway, it looks like the solution is to run copper gaskets to make up for this problem.
My question is what do I need to know about copper gaskets? Should I run the same compression height of .041 as the Fel-Pro��s, or do copper require a different gasket height? Thanks for any help, I have no experience on this topic.
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'69 Mustang Fastback, 351C, Holley 950 HP, New Parker Funnelweb intake, ported 4-v quench heads, 10.75:1, UD pulley, windage tray, Top Loader, 4.30 gears 9" rear
------------------------- 12.51 1/4 mile @ 115.89
60 foot time 2.008 (ouch)
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'69Stang
Gearhead Posts: 205
From: Detroit, MI USA
Registered: Jan 2002
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posted 06-04-2003 04:34 PM
Nobody wants to help me.....  J/K
I think I am going to go with a .032 copper gasket height unless someone advises againt it.....
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'69 Mustang Fastback, 351C, Holley 950 HP, New Parker Funnelweb intake, ported 4-v quench heads, 10.75:1, UD pulley, windage tray, Top Loader, 4.30 gears 9" rear
------------------------- 12.51 1/4 mile @ 115.89
60 foot time 2.008 (ouch)
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capri man
Gearhead Posts: 6417
From: doerun, ga.
Registered: Nov 2000
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posted 06-04-2003 04:41 PM
i want to stang, i just dont have a clue.------------------
mike r
racing is real
everything else is just a game.
81 capri-7.51 @89mph 1/8
1.54 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-04-2003 05:30 PM
How far down in the bores are your pistons at tdc? You'll want .040-.045 quench.  SteveW
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Buster
Gearhead Posts: 1437
From: Hurricane alley
Registered: May 2002
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posted 06-04-2003 10:13 PM
I run copper head gaskets but I have the o'rings in the block. I used to run the O'ring head gaskets but switch over to the copper because of the NOS I was running.I cut the grove out of the heads... I don't think its as good having the grove in the head when running copper head gaskets.
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 06-04-2003 10:20 PM
I don't know anything about copper head gaskets. I do know that most people say to have your quench height between .035 (with GOOD rods) and .045.
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'69Stang
Gearhead Posts: 205
From: Detroit, MI USA
Registered: Jan 2002
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posted 06-05-2003 10:45 AM
My engine is hardly in the hole because it was zero decked, and I have flat top pistons. The gasket I ordered is .032. Should that work or should I order the .043 gasket? Compression comes out to ~11:1 with this set up.
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-05-2003 10:54 AM
I'd get the .043 gaskets, so your pistons don't hit your heads at 7,000 rpms.  SteveW
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 06-05-2003 11:01 AM
That's tight, especially with stock rods. I have ran with .035 quench, but that was with domed pistons. And when I took that motor apart, there were shiny places in the chambers and on the pistons where they were "touching".  If you don't turn it over 7k, it should be ok with the flat tops. I would run it that way. BUT remember I like to walk the line of what is safe so what I would do might not be the best reference to go by. (Example, my motor has .065 int valve to piston clearance, and .075 exhuast and I see nothing wrong with that   )
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'69Stang
Gearhead Posts: 205
From: Detroit, MI USA
Registered: Jan 2002
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posted 06-05-2003 12:56 PM
Also, these heads have not been milled. Does that effect the picture?Is the real issue piston to valve clearance? [This message has been edited by '69Stang (edited 06-05-2003).]
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 06-05-2003 01:08 PM
quote:
Originally posted by '69Stang:
Is the real issue piston to valve clearance?
Nope, the real issue is head to piston clearance. All rods will "stretch" a little in the upper rpms. The better the rod, the less stretch. Stock cleveland rods aren't bad, especially when compared to a stock sbc rod. But they don't compare with something like a Carrillo, or Oliver billet rod very well.
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'69Stang
Gearhead Posts: 205
From: Detroit, MI USA
Registered: Jan 2002
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posted 06-05-2003 01:39 PM
Ahhhhhh, thank you. I wasn't so worried about the P/V clearance with my smaller cam (240/240, .588 lift, 112 LSA) but this makes sense.Is it O.K. to run copper o-rings with copper head gaskets??
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 06-05-2003 03:20 PM
quote:
Originally posted by '69Stang:
Is it O.K. to run copper o-rings with copper head gaskets??
I don't know. 
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-05-2003 05:16 PM
Check this,
http://www.headgasket.com/faq.html#q8SteveW
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steve'66
Gearhead Posts: 8826
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-06-2003 12:00 AM
Hope you read all that,Copper o-rings on copper gaskests should be fine. Use a thin layer of silicone on the heads and block around the water passages. And use the .043 thick gaskets too. SteveW
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'69Stang
Gearhead Posts: 205
From: Detroit, MI USA
Registered: Jan 2002
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posted 06-06-2003 02:10 PM
Yep Steve I read it, thanks alot for the info that settled it for me.
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Dynoram
Journeyman Posts: 49
From: ford country
Registered: May 2003
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posted 06-06-2003 08:02 PM
Just a note make sure the water passages do seal with the silicon around the ports. last set i treid water ended up in all kinds of places. 
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