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Posted by: rick 918-S Oct 12 2007, 09:38 PM

I stopped at my local machine shop to check on the progress on my head repair.

The first of four photos is the exhaust valve punched into the head splitting the intake seat. (Very hard!) The valve was punched into the head about 3/4" The port was split and buldged.


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Posted by: rick 918-S Oct 12 2007, 09:39 PM

Here's the buldged and split port.


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Posted by: rick 918-S Oct 12 2007, 09:41 PM

Here's the port after the repair. Very deep split and very diffecult to tig.


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Posted by: rick 918-S Oct 12 2007, 09:43 PM

Here's the combustion chamber. There is some work left but were getting close.

I'm very happy so far.


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Posted by: skline Oct 12 2007, 10:07 PM

It wasn't cheaper and faster to buy a replacement head? Seems like a lot of expensive work.

Posted by: brp986s Oct 12 2007, 10:18 PM

what caused it in the first place? iirc, you had just started from cold when this happened. Do both heads need to be reblt?

Posted by: rick 918-S Oct 12 2007, 10:23 PM

Here's the problem. I brought these heads to a shop that specializes in heads. They told me $ 900.00 Plus parts. Considering these heads had been repaired and cut I asked the specialist if he could tell me if the heads had been cut too much already. The guy didn't know how to check. I gave him instructions on the method to check them. Turns out they are on the limit.

I purchased a replacement set of used heads for $ 1000.00 (needing a valve job)

After my specialist experience I decided to educate the local shop. They checked the heads I bought and discovered they had been cut below spec.

So, back to getting mine repaired.

These heads are euro spec "S" heads. The ports are bigger, the valves are bigger, the combustion chambers are smaller.

The euro "S" heads are like rectangle port closed chamber Big Block Chev heads

The US heads are like oval port open chamber Big Block Chev heads

Posted by: rick 918-S Oct 12 2007, 10:27 PM

I'm still not sure. After attempting to get some info from the List I'm back to square one. All I can say is when this thing goes back together I'll be checking everything.

Posted by: iamchappy Oct 12 2007, 10:51 PM

I believe in aliens, proof enough for me.....

Posted by: JPB Oct 13 2007, 07:21 AM

Looks like ya gonna get it. That is such the tempting build.

Posted by: jim912928 Oct 13 2007, 07:23 AM

Rick,

Not sure if you saw this link on pelican 928 forum...but it was someone looking for a spcecific 928 machinist/engine builder that resides in Wisconsin....here is the thread to find out the contact info (just in case you need more work by someone in the 928 world).

http://forums.pelicanparts.com/showthread.php?t=369785&highlight=wisconsin

Jim

Posted by: spare time toys Oct 13 2007, 05:03 PM

Here is the link to his 427 CID 928 engine

http://www.erik27.com/todd/