Cracked valves guides tip, can I rebuild head like this? (Pictures) - Team Camaro Tech
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post #1 of 5 (permalink) Old May 30th, 15, 11:32 AM Thread Starter
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guillaumeb
 
Join Date: Mar 2009
Location: quebec
Posts: 144
Cracked valves guides tip, can I rebuild head like this? (Pictures)

Hello!

I removed the valve springs from my sbc double humps heads yesterday and wanted to swap out to new springs to match my new roller camshaft.

After inspection, I realized that most of the valve guide tips (I think they are called valve guide bosses) are cracked. It's weird, the cracks seem to be only on the outside layer of the guide. I can't see the crack going completly trough the guide neither I can see a crack from inside any of the cracked guides.

I wanted to know if that was a common issue, if that could be used for a street driven engine.

Otherwise, what are my options? Can this be re-worked? (seems that the guided on this engine are not changeable.

Can they be welded and machined? Can they drill out the guides and install new ones?

I guess I'll have to go to a machine shop but I always prefer getting your opinions before because I can't imagine a machine shop saying I can use those heads like that when they'll see the opportunity to make some cash (againnn) out of me...

thanks a lot and here are the pictures

https://www.dropbox.com/sc/j4hgcbzeh...ecD61HaQ_zmmIa
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post #2 of 5 (permalink) Old May 30th, 15, 12:18 PM
430
Sunny
 
Join Date: May 2015
Location: Watkins Glen NY
Posts: 2
Re: Cracked valves guides tip, can I rebuild head like this? (Pictures

Your heads have been core drilled and reamed for 1/2" OD replaceable cast iron guides! The thin top portion should have been spot faced down to the tapered portion below so a 1/2" x 11/32" positive seal could have been installed directly over the the new guide. Important thing is to get ride of the thin area even if you don't use positive seals as the original design o-ring seals work fine if your guides are in good shape. By the way those guides are good quality cast iron with spiral oil control ID's so at least your good to go there! A 1/2" x 11/32" positive seal cutter would remove that damaged area leaving your installed guides as is. This would be an easy operation if your heads are already off. I can send you the right cutter which you could return. We also have the best positive stem seals available if you want to go beyond the factory o-ring style seals?
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post #3 of 5 (permalink) Old May 30th, 15, 09:11 PM
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Jim
 
Join Date: Aug 2014
Location: Pennsylvania
Posts: 271
Re: Cracked valves guides tip, can I rebuild head like this? (Pictures

Yes you can change out the guides. Don't try to repair the currently installed guides. They are junk. If you don't know what you are doing, have a machine shop do it.
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post #4 of 5 (permalink) Old May 31st, 15, 05:01 PM Thread Starter
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guillaumeb
 
Join Date: Mar 2009
Location: quebec
Posts: 144
Re: Cracked valves guides tip, can I rebuild head like this? (Pictures

Hey 430! I'm sending you a message!

thanks for the replies!
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post #5 of 5 (permalink) Old Jun 16th, 15, 02:27 AM Thread Starter
Senior Tech
guillaumeb
 
Join Date: Mar 2009
Location: quebec
Posts: 144
Re: Cracked valves guides tip, can I rebuild head like this? (Pictures

Hey 430! do you receive my last messages? Can you contact me via email please?:

[email protected]

thanks a lot!
g.b.
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