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-   -   Is this head salvage or scrap? (http://forums.pelicanparts.com/911-engine-rebuilding-forum/336811-head-salvage-scrap.html)

304065 03-20-2007 05:35 PM

Is this head salvage or scrap?
 
Looks like somebody got a little excited with the bead blaster.

Seriously, any use for this 2,0 head? Or is it a paperweight?

All three photos are the same, just different zoom and flash.

http://forums.pelicanparts.com/uploa...1174440882.jpg

http://forums.pelicanparts.com/uploa...1174440904.jpg

http://forums.pelicanparts.com/uploa...1174440942.jpg

cstreit 03-20-2007 05:58 PM

Bead Blaster? Are you serious? Looks more like a shotgun blast...

turbobrat930 03-20-2007 06:01 PM

I am sure you could knock out the valve seat, reweld the head, machine, and replace the valve seat.....

I would not, however, run it like that.....

That almost looks like corrosion...not a bead blaster...

id911T 03-20-2007 06:26 PM

It's corrosion that has been removed by the bead blast. I had some like that on the outside of my intake manifolds. The corrosion is pretty soft, so the beads blast it right out of the crevasses. Honestly, in a pinch you could run it, but if its a common head, I'd try to source a new one.

cnavarro 03-20-2007 09:20 PM

I would say weld and remachine, then cryo. Should be as close to new as you are going to get on a 30+ y/o head.

304065 03-21-2007 05:35 AM

That's what I thought. As you can see from the casting number, this corrosion is on the exhaust side. The engine probably sat with water in it for a long time, and then when the heads were bead-blasted, it all eroded. Only two out of the six heads in this set are usable, but I got them for next to nothing. This one is a paperweight.

Noah, there are many applications for JB weld ranging from periodontia to birth control; this ain't one. :)

Steve@Rennsport 03-21-2007 10:33 PM

Quote:

Originally posted by john_cramer
This one is a paperweight.
A BIG "amen" to that,...:) :)

Grady Clay 03-22-2007 12:18 PM

Quote:

[i]This one is a paperweight.[/B]
+1 :D

You should be able to easily find this head. With some effort you might be able to match the date.

That corrosion is from water and other combustion products sitting there.

The risk is the corrosion found its way around and under the valve seat. This reduces the heat transfer and the interference fit of the seat in the head. If you want to see real carnage, look at an engine that has "dropped a seat."

Best,
Grady

Groesbeck Hurricane 03-25-2007 07:25 AM

John,

That is NOT a paperweight!!!

Obviously you have never seen a trot line weight....

Man, is that worth bringing back? I'd think the cost of replacing the 30 year old part would be more than the cost of repairing it, if the repair is possible with a reasonable amount of certainty...


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