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Help with a problem on my 440 #238408
02/27/09 09:40 PM 02/27/09 09:40 PM
Joined: Jan 2003
Posts: 2,343
west palm beach, florida
modelmakerinc Offline OP
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modelmakerinc  Offline OP
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Joined: Jan 2003
Posts: 2,343
west palm beach, florida
Hey all, I was taking my car out for cruise night and as I was leaving I noticed a water leak from under #3 & #5 exhaust port.

I am thinking it is a head gasket and the water is wicking up the head bolt?, or what where would this be coming from.

big pic sorry about the size but I wanted you to get a good look.




Exceptional Architectural, Yacht and Automotive scale models. e-mail modelmakerinc@att.net for a portfolio review. www.modelmakerinc.com
Re: Help with a problem on my 440 [Re: modelmakerinc] #238409
02/27/09 09:56 PM 02/27/09 09:56 PM
Joined: Nov 2007
Posts: 21,819
Kirkland, Washington
Pacnorthcuda Offline
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Pacnorthcuda  Offline
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Joined: Nov 2007
Posts: 21,819
Kirkland, Washington
Simple, your exhaust header stud is leaking, thats all. You need to disco the header, (just from the head), remove the stud (may as well do all) and re-install with thread sealant on the studs.
Re: Help with a problem on my 440 [Re: Pacnorthcuda] #238410
02/27/09 10:09 PM 02/27/09 10:09 PM
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
T
TRENDZ Offline
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TRENDZ  Offline
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
It is very common to have a 2" long horizontal crack in the cylinder head under the center exhaust ports. I'd bet a dollar that's what it is... sorry!

"use it 'till it breaks, replace as needed"
Re: Help with a problem on my 440 [Re: TRENDZ] #238411
02/27/09 10:22 PM 02/27/09 10:22 PM
Joined: Jan 2003
Posts: 2,343
west palm beach, florida
modelmakerinc Offline OP
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modelmakerinc  Offline OP
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Joined: Jan 2003
Posts: 2,343
west palm beach, florida
It is not the studs, I use hi temp silicone on the header flange because of poor welding/ sealing of the headers. if it is the head, How can I confirm without dissasembly.

Exceptional Architectural, Yacht and Automotive scale models. e-mail modelmakerinc@att.net for a portfolio review. www.modelmakerinc.com
Re: Help with a problem on my 440 [Re: modelmakerinc] #238412
02/27/09 10:38 PM 02/27/09 10:38 PM

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if you want to bring it by the shop, i'd be happy to take a look at it for you.
Re: Help with a problem on my 440 #238413
02/27/09 10:47 PM 02/27/09 10:47 PM
Joined: Mar 2004
Posts: 2,475
SW Ohio
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cgall Offline
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SW Ohio
Did you put those studs in dry? It would only take a few minutes to pull that stud and replace it with a header bolt with a dab of silicone on it.
Re: Help with a problem on my 440 [Re: cgall] #238414
02/27/09 10:51 PM 02/27/09 10:51 PM
Joined: Jan 2003
Posts: 2,343
west palm beach, florida
modelmakerinc Offline OP
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modelmakerinc  Offline OP
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Joined: Jan 2003
Posts: 2,343
west palm beach, florida
believe it or not the studs are original to the heads, I requested the machine shop to leave them installed throughout the process. I can assure you they are not leaking.

Exceptional Architectural, Yacht and Automotive scale models. e-mail modelmakerinc@att.net for a portfolio review. www.modelmakerinc.com
Re: Help with a problem on my 440 [Re: TRENDZ] #238415
02/27/09 11:21 PM 02/27/09 11:21 PM
Joined: Aug 2003
Posts: 43,115
Bend,OR USA
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Cab_Burge Offline
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Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 43,115
Bend,OR USA
Quote:

It is very common to have a 2" long horizontal crack in the cylinder head under the center exhaust ports. I'd bet a dollar that's what it is... sorry!

I have seen around a dozen or more 906 heads with cracks under the center exhaust ports, it is a weak point in the engine design IMO. People will drain the block and not install antifreeze, especially racers. The heads have a water passage under the exhaust ports that does not drain and ends up freezing causing the crack I have seen machine shops(non Mopar knowleable usually) miss those cracks when the inspect and magnaflux those heads

Last edited by Cab_Burge; 02/28/09 01:59 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Help with a problem on my 440 [Re: Cab_Burge] #238416
02/27/09 11:25 PM 02/27/09 11:25 PM
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT Offline
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1_WILD_RT  Offline
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
Looks like a good excuse to put some better heads on it....
Re: Help with a problem on my 440 [Re: 1_WILD_RT] #238417
02/27/09 11:36 PM 02/27/09 11:36 PM
Joined: Jan 2003
Posts: 25,200
Upper Midwest
M
MoparforLife Offline
Too Many Posts
MoparforLife  Offline
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
for a minor leak like that I would dump a jug of Bars leak or other good sealer into it and forget it. It will seal with no problem I am sure. Seen worse ones than that sealed and never give any sign of a problem.
Re: Help with a problem on my 440 [Re: MoparforLife] #238418
02/27/09 11:44 PM 02/27/09 11:44 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
MR_P_BODY  Offline
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Joined: Jun 2003
Posts: 52,972
Romeo MI
Quote:

for a minor leak like that I would dump a jug of Bars leak or other good sealer into it and forget it. It will seal with no problem I am sure. Seen worse ones than that sealed and never give any sign of a problem.



.... sure wont hurt to dump a can in
Re: Help with a problem on my 440 [Re: MR_P_BODY] #238419
02/28/09 12:37 AM 02/28/09 12:37 AM
Joined: Nov 2004
Posts: 2,119
sc
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tjmarcus1 Offline
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tjmarcus1  Offline
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Joined: Nov 2004
Posts: 2,119
sc
i think you are gonna find a crack. common place for it.
Re: Help with a problem on my 440 [Re: tjmarcus1] #238420
02/28/09 06:45 AM 02/28/09 06:45 AM
Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
moparguy7074 Offline
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moparguy7074  Offline
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Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
Quote:

i think you are gonna find a crack. common place for it.



I had the exact same problem on a set of 906 heads. Thought it was leaking around the head bolts, nope, cracked head.


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