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One cylinder head different. Bit of a mystery.

So I'm digging into my 1978 SC's 3.0 L engine to replace the exhaust side head studs. I got one broken one. I've got a thread running over on rennlist...

My 1978 3.0 L head stud replacement thread - Rennlist Discussion Forums

But, to the point of this post. I've found that one cylinder head is different from the others (pics below).

The intake side of #5 has more "missing" fins.



And what I assume is a production date stamp is different. Other number markings are identical.

Date stamp of #5


Date stamp of other heads


When I bought the 911, it had harness eye bolts in the rear bulk head and rear floors. And, the second owner had the very old harnesses among his pile of stuff. It's pretty clear it saw some track work back in the day with the original owner. A few years ago when I took off the sump plate to change it, I found a broken valve "elephant foot" up against the sump screen, and now it's evident a cylinder head has been replaced. Clearly, there has been a major failure in the past, possibly on the track. I wonder if it was a broken valve spring, which is a known problem with 78's.

Anyway, can anyone comment on or identify the different cylinder head? The "missing" fins do not appear to be broken or machined off. It looks cast that way.

Brett
Old 09-01-2011, 10:02 AM
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If I had to guess I would say it got rebuilt with a 2.7 head? Still, 8/77 was the time they were building the '78s so maybe you just got revision 1 of the casting. Might find a much more accurate answer on the engine rebuilding forum, though.
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Old 09-01-2011, 10:30 AM
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No, No, A 2.7 head will not fit on a 3.0 case. You have an early 3.0 head with less fins. Not a perfect match but should work fine.
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Old 09-01-2011, 11:18 AM
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The casting K1929d is your match
Bruce
Old 09-01-2011, 11:33 AM
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You mean K1926....
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Old 09-01-2011, 11:38 AM
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Thanks for the comments. I'll not worry about it further.

Brett
Old 09-02-2011, 09:28 AM
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I should have just turned the engine over and looked at the part number on the exhaust side. LOL



Brett
Old 09-07-2011, 09:03 AM
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