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Re: anyone running cracked magnum heads?
[Re: racerx]
#1166012
01/27/12 06:22 PM
01/27/12 06:22 PM
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Joined: Dec 2006
Posts: 3,533
Indiana
Fury Fan
master
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master
Joined: Dec 2006
Posts: 3,533
Indiana
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A 95 is OBD-1, and check engine usually means a a malfunction with an emissions item. OBD-2 can set a light for a cylinder misfire, but it would take 1 big crack to leak enough compression to cause a misfire.
Yes, Hughes makes an improved casting that also has press-in seats (OEM is induction hardening of the cast-in seat).
EngineQuest also has the same head, there are a few places on Ebay that sell the cheaper replacements (meaning, all stock valves, springs, etc). Look for 'Clearwater', IIRC.
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Re: anyone running cracked magnum heads?
[Re: Fury Fan]
#1166013
01/28/12 05:38 PM
01/28/12 05:38 PM
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Joined: Mar 2005
Posts: 1,445
Sterling Heights, Michigan 483...
daniel_depetro
pro stock
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pro stock
Joined: Mar 2005
Posts: 1,445
Sterling Heights, Michigan 483...
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I currently have three 5.9L Magnum engine powered Dodge Ram 2wd Trucks (a 1999 1500 with 255k, a 2001 1500 with 160k, and a 2001 2500 with 175k). Likely all of them have cracked heads and all three trucks run fantastic. No loss of power, no smoke, no coolant loss. I also run a carbureted 5.9L Magnum engine in a Duster and it too has the original heads (engine was from 2000 Dodge Ram Van 2500 with 130k).  I do have a pair of Mopar Performance R/T iron heads, and Mopar Performance Magnum aluminum heads that will eventually make their way on to a couple of the above vehicles.I bought the MP heads years ago, so that may actually never happen. 
1969 Dodge Super Bee A12 (440 Six Pack, 4-speed, Dana 60 4.10)
1972 Plymouth Road Runner (400, 4-speed, 8.75" 3.23)
1974 Plymouth Duster 360 (360, 4-speed, 8.75" 3.23)
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Re: anyone running cracked magnum heads?
[Re: 1980volare]
#1166015
01/28/12 09:00 PM
01/28/12 09:00 PM
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Joined: Aug 2008
Posts: 4,076
Mo.
racerx
master
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master
Joined: Aug 2008
Posts: 4,076
Mo.
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Quote:
mine had 1 crack, my machine shop pressure tested the head and it was fine. no loss of coolant, and no burning of coolant. id imagine 75% of magnum heads are cracked somewhere. if it hold pressure, use em.
I'm  u say that one head has a crack,then it was presure tested with no cracks  so were was the crack?
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Re: anyone running cracked magnum heads?
[Re: d-150]
#1166017
01/28/12 09:13 PM
01/28/12 09:13 PM
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Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
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They do crack between the valves but the crack seems to dead head into nothing and not leak. The cracks usually (almost always) show up on a magnaflux or zy-glo test but almost always pass a pressure test(actually never seen one fail). That shows they are there but doing no harm.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: anyone running cracked magnum heads?
[Re: 1980volare]
#1166018
01/28/12 10:49 PM
01/28/12 10:49 PM
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Joined: Oct 2010
Posts: 582
Dayton, OH
1980volare
My man card has just been revoked.
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My man card has just been revoked.
Joined: Oct 2010
Posts: 582
Dayton, OH
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has a crack, between the valves. doesnt leak any coolant. doesnt effect performance in any way. most heads that are cracked are easily visible with the naked eye after a good cleaning.  if there cracked, get them pressure tested, and if they check out run em.
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Re: anyone running cracked magnum heads?
[Re: 1980volare]
#1166019
01/28/12 11:13 PM
01/28/12 11:13 PM
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Joined: Jul 2003
Posts: 6,167
Maryland
GO_Fish
master
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master
Joined: Jul 2003
Posts: 6,167
Maryland
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anyone running cracked magnum heads? To the O/P, almost everyone running a truck with a 5.9 V8 has cracked heads that don't hurt anything (whether they know it or not). Not usually a fatal flaw. If there is no white smoke or coolant loss, there is no problem.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph
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Re: anyone running cracked magnum heads?
[Re: Rug_Trucker]
#1166024
01/29/12 09:53 PM
01/29/12 09:53 PM
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Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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The cracks tend to be very small, sometimes impossible to see when you know where one is located. Even if not filled in with carbon (unlikely) the effect on leak-down would be close to zero, much less than ring end gaps.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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Re: anyone running cracked magnum heads?
[Re: Rapid340]
#1166025
01/30/12 11:39 AM
01/30/12 11:39 AM
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Joined: Aug 2005
Posts: 4,799
ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,799
ILL
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Quote:
The cracks tend to be very small, sometimes impossible to see when you know where one is located. Even if not filled in with carbon (unlikely) the effect on leak-down would be close to zero, much less than ring end gaps.
I agree somewhat with what your saying but over time the exhaust valve side of the crack will burn the valve face and show up as a mis-fire.
It's just a matter of time. And yes magnum heads are famous for this cracking problem, it is a thick part of the casting between the seats and it will in time cause problems with valve sealing.
logan426
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Re: anyone running cracked magnum heads?
[Re: MLR426]
#1166026
01/31/12 11:21 AM
01/31/12 11:21 AM
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Joined: Aug 2008
Posts: 4,076
Mo.
racerx
master
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master
Joined: Aug 2008
Posts: 4,076
Mo.
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Seems like a few guy on have these heads on there car/trucks that runs very well anyone ever thought or tried any of this stuff http://www.autozone.com/autozone/accesso...omString=search seems everyone has very little to none leakage wondering if this stuff works  or is it just a bandage?
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Re: anyone running cracked magnum heads?
[Re: racerx]
#1166027
01/31/12 12:51 PM
01/31/12 12:51 PM
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Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
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I have never seen a cracked head cause a problem on a magnum motor and I have worked on tons of them. As for the head gasket/crack aditive you should definately NOT use it. I have seen it plug heater cores and radiators. 
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: anyone running cracked magnum heads?
[Re: racerx]
#1166028
01/31/12 03:47 PM
01/31/12 03:47 PM
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Joined: Oct 2010
Posts: 582
Dayton, OH
1980volare
My man card has just been revoked.
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My man card has just been revoked.
Joined: Oct 2010
Posts: 582
Dayton, OH
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Quote:
Seems like a few guy on have these heads on there car/trucks that runs very well anyone ever thought or tried any of this stuff http://www.autozone.com/autozone/accesso...omString=search seems everyone has very little to none leakage wondering if this stuff works or is it just a bandage?
temporary solution to a permenate problem
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truck run fine.It has a little of white smoke coming out of the exhaust 
engine lite stays on.I'm not up on the magnum engine i ask this ? b4 and people say that's common with this heads.I'm looking to replace the heads this year 
