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Author
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Topic: Stripped threads in Alum Head. Now what?
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bud4660
Gearhead Posts: 513
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 07-17-2004 06:46 PM
   
We were putting the intake back on a friends 390. He has the edelbrock heads. He just got them back out of the shop from a helicoil pulling out of the rocker arm shaft mounts. So as we are putting the intake on, one of those holes pulls part of the threads out. He is thinking about trying to JB Welding threads back in the hole so we can put a stud in that hole. The plan is to put grease on the stud so the JB Weld dont stick to it and we can screw it back out. I dont like this idea. Anybody have any other idea's besides drilling it and putting a helicoil in it.
Thanks
Bud
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Bloose
Gearhead Posts: 621
From: Milwaukee, WI
Registered: Dec 2001
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posted 07-17-2004 07:40 PM
http://www.aluminumrepair.com/login/main.aspDon't know if it works but it may be worth a try. JC Whitney sells something simular but it is much less money. Not sure if the cheaper price means a cheaper product though. HTH,
B-loose
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ukracer
Gearhead Posts: 151
From: South Wales UK
Registered: Apr 2003
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posted 07-19-2004 04:40 AM
I managed to strip one of the exhaust (header) bolt holes in my aluminium CJ heads (FMS). I had it helicoiled and it's been fine. I think it's probably the easiest/best fix without welding.
Cheers, Martin
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bud4660
Gearhead Posts: 513
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 07-19-2004 08:41 AM
Ok. Thanks Guys. We were trying to do this without having to pull everything back apart. But that welding deal looks really cool for repairs. He was talking about helicoils in all the holes if we have to take it a part. These heads have been a pain from the get go.
Thanks again
Bud
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Ryan Wilke
Gearhead Posts: 2060
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 07-20-2004 08:27 AM
quote:
Originally posted by bud4660:
We were putting the intake back on a friends 390. He has the edelbrock heads. He just got them back out of the shop from a helicoil pulling out of the rocker arm shaft mounts. So as we are putting the intake on, one of those holes pulls part of the threads out. He is thinking about trying to JB Welding threads back in the hole so we can put a stud in that hole. The plan is to put grease on the stud so the JB Weld dont stick to it and we can screw it back out. I dont like this idea. Anybody have any other idea's besides drilling it and putting a helicoil in it.
Thanks
Bud
Bud,
Since the helicoil that pulled out was installed by Edelbrock, I'd be a bit concerned about the others possibly pulling out as well....maybe not now, but maybe later? You may even consider putting a call over to Edelbrock and asking them for their recommendation. Just my 2 cents,
Ryan 
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bud4660
Gearhead Posts: 513
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 07-20-2004 09:28 AM
quote:
Originally posted by Ryan Wilke:
Bud,
Since the helicoil that pulled out was installed by Edelbrock, I'd be a bit concerned about the others possibly pulling out as well....maybe not now, but maybe later? You may even consider putting a call over to Edelbrock and asking them for their recommendation.Just my 2 cents,
Ryan
Its a problem on those heads. He has talked to edelbrock severial times on these heads. The hole that stripped out now is just threaded I believe. I dont remember seeing a helicoil in there. I think the plan is this winter to take them off and put helicoils in all the intake holes. He has a new short block being built for next year. From the problems I have seen out of these heads I would never buy a set. Blue Thunder is suppose to be coming out with a set sooner or later. So if I life long enough I think I'm going that way....lol
We are just trying to keep this motor together for the rest of the year.
Thanks
Bud
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Greg Pettit
Gearhead Posts: 107
From: Dallas, TX
Registered: Nov 2001
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posted 07-20-2004 11:11 AM
I have a set of 460 Edelbrock heads, and they are great.All high stress areas are helicoiled. Have had "0" problems so far. Not saying you guys did anything wrong, but it is not uncommon for excessive torque to cause real problems for aluminum. If you use assembly lube or moly lube on the threads, or even anti-sieze, you must be EXTRA careful not to overtorque the fastner. I do not remember the name of the company, but there is a product similar to helicoil that uses a steel insert vs. a stainless wire. It uses a bigger drilled hole to start with, so there may be a chance to use it even though a helicoil may have pulled out. Good luck, Greg ------------------
'71 Torino GT 466, Edelbrock CJ RPM heads, 11.15:1, 250/262 solid flat tappet, .614/.640 lift, 850 DP, C6 w/3500 stall
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bud4660
Gearhead Posts: 513
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 07-20-2004 11:21 AM
I hear you. There is a lot of people running the heads with no problems. I think alot of it has to do with whats been done to them and the cam lift. The heads have been cut so much that you can barely get the holes to line up on the intake, and its been cut down as much as it will go. And you have to use silicone because the gaskets are to thick. Its not a street motor. So far its just a headache....lol
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TomP
Gearhead Posts: 5761
From: Delta BC Canada
Registered: Dec 99
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posted 07-20-2004 01:40 PM
BudYou may have answered the question yourself there. Milled heads. The intake bolts are now probably trying to fight there way into the threads at an angle. Steel bolt + aluminum heads = aluminum loses. Those bigger inserts (Timeserts?) may be OK but you need to make sure there is enough material around the hole, water jackets and thin castings can sometimes mean the original threads need to be left alone.
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JAAZZY
Gearhead Posts: 777
From: Bay Area, CA
Registered: Apr 2001
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posted 07-21-2004 01:50 PM
I had a similar problem when we went to torque down my intake. We hadn't even gotten it torqued all the way and the head cracked(TFS heads) around the bolt. The whole piece just fell off. I had it welded back together but was worried it would happen in another location so I had a machine shop slot all of my intake bolt holes and I used longer intake bolts. This solved the problem. I think it was due to a very slight amount of stress due to my heads having been milled. Slotting the intake alleviated the problem.[This message has been edited by JAAZZY (edited 07-21-2004).]
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bud4660
Gearhead Posts: 513
From: Mesquite, Tx. M&M #2925
Registered: Apr 2003
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posted 07-21-2004 04:13 PM
Thanks Guys.
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