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Re: anyone have GOOD luck with the mopar alum hemi heads
[Re: 3ddart]
#658086
04/01/10 02:47 PM
04/01/10 02:47 PM
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Joined: Jan 2004
Posts: 4,866
North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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I have had them on my last 3 hemi cars. The last set i had were CNC ported modern heads, that made a 1000 horsepower. I have had good luck.
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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Re: anyone have GOOD luck with the mopar alum hemi heads
[Re: 3ddart]
#658087
04/01/10 04:35 PM
04/01/10 04:35 PM
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Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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Quote:
well, anyone that follows the hemi posts on here are most likely aware that torkrules is the latest victim of the seat falling out of a mp aluminum hemi head. my hope goes out to john that his luck on his project will change for the better! my ? then is being that john is not the 1st on here to have this happen, is there anyone who has put 10,000 miles on there aluminum headed hemi and not had problems? i'm wondering out loud if we are all going to experience this or did some good 1's get out the door and how can you tell what you have, good or bad. thanks dave
Hi Dave,
Thanks for the good wishes. FWIW, I had about 4000 miles on these heads. When I had the guides re-done about 2 years ago I asked Tim Banning about the rumors. His point of view was that they usually fall out right away (on the dyno). If they don't, the chances of them falling out decreases. I for one and I think a couple of others had seats drop around the 3000-5000 mile mark.
He said that all he could really do is check to see if they were loose when he re-cut the seats. There's no real fool proof way to detect if there's a problem. The next best thing to do is remove all of the seats and install new oversized ones, but I think the expense would be close to a new set of heads.
I sincerely hope that you or anyone else using these heads got a good set and never have trouble with them. I did not mean to be a fear monger, but in good conscience I could not keep this quiet in the hopes of prevented anyone else from having the grief I have experienced.
I really was planning to put the engine back in this weekend and enjoy some of this nice weather.
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Re: anyone have GOOD luck with the mopar alum hemi heads
[Re: 3ddart]
#658089
04/01/10 06:55 PM
04/01/10 06:55 PM
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Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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Quote:
john: i for 1 am glad you brought it to our attention. when this happened before (sorry can't remember the member that had the problems) you and i talked via pms about this and it bothered me then. at that time the motor was still unassembled and i thought about what my options were and decided to stay the course. now the motor has been assembled, run on a break-in stand and installed. this has been just 1 project from the last 9 yrs and of course i get asked about the HEMI all the time and i'm hoping to get it on the road this summer. i just winch when i think of the possibilty of that happening and so i was looking (hoping) for some positive feedback via this fourm. again i thank you for stepping up and letting us know about it and sincerly hope your luck takes a turn for the better with your car project. dave
Thanks buddy! 
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Post deleted by Defbob
[Re: HemiDart68]
#658090
04/01/10 08:45 PM
04/01/10 08:45 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Re: anyone have GOOD luck with the mopar alum hemi heads
#658091
04/02/10 09:22 AM
04/02/10 09:22 AM
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Joined: Jan 2004
Posts: 4,866
North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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Quote:
Quote:
I have had them on my last 3 hemi cars. The last set i had were CNC ported modern heads, that made a 1000 horsepower. I have had good luck.
there were some that did not have any problem but there is no way to tell good from bad. no one knows if it was an entire run that was bad and just a few good ones ame out of that batch.
I guess i should follow on by saying my new motor has Milleniums. No Mopar perts here.
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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Post deleted by Defbob
[Re: HemiDart68]
#658092
04/02/10 12:18 PM
04/02/10 12:18 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Re: anyone have GOOD luck with the mopar alum hemi heads
#658093
04/02/10 01:21 PM
04/02/10 01:21 PM
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Joined: Jan 2003
Posts: 1,374
Houston,Tx.
Lee446
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,374
Houston,Tx.
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After buying a Cummins 528 and correcting all of the problems with it, this comes up!! I just invested a fair amount of $ with Jeff @ Modern getting the MP heads straightned out, sloppy guides, bent exhaust valves, junk springs, retainers, locks. At the time, I talked with Jeff and he said that he had not experienced the seat issue, but he had heard of it second hand. I appreciate the guys who know of this first hand reporting it. I can't help but wonder, surely there must be some way of identifying what the conditions are for this problem. If it is just poorly installed seats, bad seats, or a defective head casting, there must be a way of identifying the cause! As a potential victim of this, I don't mind kicking in some cash to have the defective head examined to determine the cause. It would be worth it to all of us with these heads to find out what we can do to keep this disaster from happening to us. I can't afford to lose the investment I have in my Hemi. Lee.
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Post deleted by Defbob
[Re: Lee446]
#658094
04/02/10 01:28 PM
04/02/10 01:28 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Re: anyone have GOOD luck with the mopar alum hemi heads
[Re: Mac's Hemi 64]
#658096
04/02/10 04:21 PM
04/02/10 04:21 PM
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Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
torkrules
I'm neurotic
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I'm neurotic
Joined: Nov 2003
Posts: 2,715
closer to Canadian beer!
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Quote:
What are the casting dates for the heads that have had problems? Maybe there will be a pattern show up. I have not had any problems with my 1997 cast MP aluminum heads so far. 
I bought mine around late 2006/early 2007. Lets say they sat on the shelf for a year. So I would probably say 2004 up to the time they switched to Eddy.
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Re: anyone have GOOD luck with the mopar alum hemi head
[Re: 3ddart]
#658097
04/02/10 06:19 PM
04/02/10 06:19 PM
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Joined: Jul 2006
Posts: 4,179
California
mickm
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Joined: Jul 2006
Posts: 4,179
California
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i have the same heads. i have no idea, but have to say mine were bought in the 2004 period as well. at this point i think i have about 8k miles on the engine, (about to be 9k for spring fling).
but what can you do? it definitely seems to me so far that although people have seen otherwise, the overall rumor is that if they are going to fall out, it will be right away.
if i had that happen, all i could do is park the car for now, no matter how minimal the damage was. since there is no way to check to see if anything is up with the seats, i'm just going to drive it.
oh, and my heads got a port and valve job 1-2k miles ago by a very good head guy, so at least he didn't notice anything suspicious.
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Re: anyone have GOOD luck with the mopar alum hemi head
[Re: Lee446]
#658100
04/02/10 09:47 PM
04/02/10 09:47 PM
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Joined: Jan 2004
Posts: 4,866
North of Detroit
HemiDart68
master
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master
Joined: Jan 2004
Posts: 4,866
North of Detroit
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Honestly if i have had already purchased the heads i would definatly run them. I know of a couple people on here had problems. I personally have had 3 sets, and know alot of others running around without a problem. I would say that the chances of the seats dropping are very slim. I wouldn't go scraping a set of hemi heads over it. Or you can ship them to me ill use em. i give you my fed ex number, no cost to you. 
In God we trust, all others pay cash.
www.lightnens.com (Home of the world's fastest Paint Job)
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Re: anyone have GOOD luck with the mopar alum hemi heads
[Re: B G Racing]
#658104
04/03/10 10:14 AM
04/03/10 10:14 AM
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Joined: Jan 2003
Posts: 1,374
Houston,Tx.
Lee446
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,374
Houston,Tx.
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Bob, could you explain to us novices, what actually causes seats to come loose? When you talk of a seat not being centered to the valve guide, does that mean it loads the seat to one side and tries to pop it out like a bottle cap? If there is a problem with the casting or the alloy, (and what is the liklihood of this?)would welding the seat area and remachining it be worthwhile or a crapshoot? It would seem like there would be a way to determine the underlying cause of this, I remember back in the early days of production aluminum heads they had problems that obviously got worked out. If the seat is strictly a press fit, would the likely culprit be poor machining tolerances? Also, who manufactured these heads anyway? I appreciate your help! Lee.
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dave
