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Re: Damaged cylinder head repair [Re: csk] #3082851
10/03/22 01:09 PM
10/03/22 01:09 PM
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Las Vegas
Al_Alguire Offline
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As said EASY fix and by all means replace ALL the valves.


"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"
Re: Damaged cylinder head repair [Re: Al_Alguire] #3082860
10/03/22 01:26 PM
10/03/22 01:26 PM
Joined: Aug 2011
Posts: 2,640
Pattison Texas
csk Offline
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Originally Posted by Al_Alguire
As said EASY fix and by all means replace ALL the valves.


Yes, after further thought , ALL of the valves not just the intake


1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392

Re: Damaged cylinder head repair [Re: csk] #3082863
10/03/22 01:33 PM
10/03/22 01:33 PM
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So. Burlington, Vt.
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fast68plymouth Offline
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Originally Posted by csk
Originally Posted by fast68plymouth
Well, I see what’s 99% likely the cause of the failure.


Yep, & replace ALL the intake valves, new springs & double check PV clearance


My guess is, it’s the #1 reason for broken intake valves.


On the plus side........ I’m liking the complete lack of carbon build up in that intake bowl.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Damaged cylinder head repair [Re: fast68plymouth] #3082895
10/03/22 01:59 PM
10/03/22 01:59 PM
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pittsburghracer Offline
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Remember some broken pieces could have gone into other cylinders Even on the other side. My son had a 1/4 inch chunk of an Edelbrock intake valve in number three cylinder end up stuck in number 4 or 6 and pinch a ring.


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: Damaged cylinder head repair [Re: fast68plymouth] #3083030
10/03/22 07:49 PM
10/03/22 07:49 PM
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carnut68 Offline OP
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Originally Posted by fast68plymouth
Well, I see what’s 99% likely the cause of the failure.
Ok. Give me the good or bad news. The spring looks like new in that it was not moving around same for the keepers and retainer. No metal scuffing at all. I'm thinking the valve gave up. Or # 5 rod bearing went but it still had 60# oil pressure.

Re: Damaged cylinder head repair [Re: carnut68] #3083053
10/03/22 09:08 PM
10/03/22 09:08 PM
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Loudoun County, VA
Brad_Haak Online content
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Don't know what the top of the piston w/ the broken valve looks like, but I'd be looking very closely at all of the piston tops for any indications of other valves possibly coming into contact, too. scope

Re: Damaged cylinder head repair [Re: Brad_Haak] #3083060
10/03/22 09:28 PM
10/03/22 09:28 PM
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carnut68 Offline OP
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Originally Posted by Brad_Haak
Don't know what the top of the piston w/ the broken valve looks like, but I'd be looking very closely at all of the piston tops for any indications of other valves possibly coming into contact, too. scope
It's bashed up and has a hole were the valve stem went thru it. The cylinder wall looks fine. #7 did,but when? Probably after #5 broke.

Re: Damaged cylinder head repair [Re: carnut68] #3083171
10/04/22 09:08 AM
10/04/22 09:08 AM
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So. Burlington, Vt.
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fast68plymouth Offline
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This pic tells the tale:

B3A6D524-2D92-491D-992B-F83CAF3C78B8.png

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Damaged cylinder head repair [Re: fast68plymouth] #3083172
10/04/22 09:12 AM
10/04/22 09:12 AM
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central texas
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krautrock Offline
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aha! i was wondering if you were referring the shiny and kinda marred edges of the other intake valve.

Re: Damaged cylinder head repair [Re: krautrock] #3083177
10/04/22 09:24 AM
10/04/22 09:24 AM
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So. Burlington, Vt.
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fast68plymouth Offline
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I have some BBC heads here now that have a few valves showing the same thing.

There’s really only one way to get that shiny ring.

F00B0694-278B-4AEF-8EDA-CA9A28D2F2BE.png

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Damaged cylinder head repair [Re: fast68plymouth] #3083179
10/04/22 09:35 AM
10/04/22 09:35 AM
Joined: May 2019
Posts: 518
Lake Villa Il
INTMD8 Offline
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Lake Villa Il
Originally Posted by fast68plymouth

There’s really only one way to get that shiny ring.


A very intimate relationship resulting in a shiny ring. Then everything crumbles after too much hitting and abuse.

Sounds like a lifetime movie


69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 595rwhp 475rwtq.
Re: Damaged cylinder head repair [Re: INTMD8] #3083183
10/04/22 09:46 AM
10/04/22 09:46 AM
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So. Burlington, Vt.
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fast68plymouth Offline
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The thing is, the fact that it’s showing contact for the full diameter means the valve is rotating, since nothing would touch all the way around otherwise.

So, the rotation means there is some degree of the stem flexing in different directions as the valve rotates around.
Like bending a coat hanger back and forth......... it can only flex so many times before the material is fatigued and breaks.

In my mind, the question as to why the valve broke has been answered.

Also, the contact is not the result of valvetrain control problems.
That’s not to say there couldn’t be some of that as well, but that won’t result in contact with an intake valve.
When you float an intake valve, even if it’s lagging way behind the cam....... at IVC, the piston is nowhere near TDC.
So, the only way to get the shiny ring on an intake valve is....... inadequate clearance during the IVO period.

It’s not all that uncommon for me to see this condition when I’m reconditioning heads.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: Damaged cylinder head repair [Re: carnut68] #3083686
10/05/22 09:27 PM
10/05/22 09:27 PM
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carnut68 Offline OP
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Any suggestions who to send the head to get it fixed?

Re: Damaged cylinder head repair [Re: carnut68] #3083741
10/06/22 08:09 AM
10/06/22 08:09 AM
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J_BODY Offline
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Originally Posted by carnut68
Any suggestions who to send the head to get it fixed?


Hopefully it’s a quality casting. I sent my leaky W5 head to a guy in Iowa that had brought sprint car heads back from the dead. My head basically crumbled as he tried to weld it.

Re: Damaged cylinder head repair [Re: carnut68] #3083757
10/06/22 09:00 AM
10/06/22 09:00 AM
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Loudoun County, VA
Brad_Haak Online content
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Originally Posted by carnut68
Any suggestions who to send the head to get it fixed?

Indy would be my first call, considering they did lots of cylinder head repair work in the past. Whether the new owners do any of that, you'll only know by asking.

Re: Damaged cylinder head repair [Re: Brad_Haak] #3083772
10/06/22 09:56 AM
10/06/22 09:56 AM
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Posts: 341
Sidney,Ohio
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challenger1320 Offline
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Indy still does repair work and it is second to none. I had a block fixed and if you didn't look real close you could not tell it was ever hurt. They also fixed my B1 heads last year and they look perfect.

Re: Damaged cylinder head repair [Re: carnut68] #3083901
10/06/22 06:49 PM
10/06/22 06:49 PM
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carnut68 Offline OP
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It's an Indy head. So that's good to hear. Thanks.

Re: Damaged cylinder head repair [Re: pittsburghracer] #3083926
10/06/22 08:25 PM
10/06/22 08:25 PM
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pittsburghracer Offline
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Originally Posted by pittsburghracer


You won’t know till it’s taken apart and stripped but I’m betting it’s fixable. Jump on it and get it to a shop before everyone else. Winters coming. Indy may even fix it.




Wow I suggested Indy 10-1-22. Lol 😂


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: Damaged cylinder head repair [Re: pittsburghracer] #3083950
10/06/22 10:13 PM
10/06/22 10:13 PM
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J_BODY Offline
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Originally Posted by pittsburghracer
Originally Posted by pittsburghracer


You won’t know till it’s taken apart and stripped but I’m betting it’s fixable. Jump on it and get it to a shop before everyone else. Winters coming. Indy may even fix it.




Wow I suggested Indy 10-1-22. Lol 😂


We don’t listen to old guys! laugh2 …..all kidding aside it’s a great time we live in when you can actually recommend Indy for something.

Re: Damaged cylinder head repair [Re: carnut68] #3084164
10/07/22 09:33 PM
10/07/22 09:33 PM
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carnut68 Offline OP
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What about Brett Miller? He's within reasonable driving distance.

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