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Old 01-23-2007, 03:04 PM   #1
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I'm guessing this is the right place. It'* not really a mechanical issue, nor is it performance/brainstorming I don't believe.

My question is this. I could swear I've either heard of or read of 1997 3800 heads having a problem cracking under higher spring pressures. Is it the spring seat or the valve seat that cracks, and why?
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Old 01-23-2007, 03:06 PM   #2
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You are correct on the 1997 being the head cracking year.

Not sure where..but did ask Todd while at Intense. He mentioned that if I ever pull my heads for any reason and have them cleaned/magnafluxed I should expect to see cracks. Almost all 97'* have them.

That makes me think it'* not necessarily just the spring area...but in general.
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Old 01-23-2007, 03:10 PM   #3
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Okay, I got a set of 97'* here and I'll check em out. Maybe I got lucky and these are from the begining or end of the year and the problem had been solved I doubt it though.
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Old 01-23-2007, 03:25 PM   #4
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And Boosty said 97s were better...plsh...

Is there any stampings on the heads, maybe you could check the dates to see when it was made (you said it was a 97) it could be the beginning or the end of 97
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Old 01-23-2007, 03:31 PM   #5
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Let'* keep it on topic for Doug...
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Old 01-23-2007, 09:28 PM   #6
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I think I read/saw pics where the cracks are between the I and E valves.
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Old 01-23-2007, 09:38 PM   #7
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I wonder what is different in the 97 as opposed to the other year'* cyl heads to have that problem?
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Old 01-23-2007, 10:54 PM   #8
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Quote:
Originally Posted by PEARL_JAM
I wonder what is different in the 97 as opposed to the other year'* cyl heads to have that problem?
If I had to guess, I would think something to do with how they treat/harden the valve seats.
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Old 01-23-2007, 11:13 PM   #9
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Quote:
Originally Posted by PEARL_JAM
I wonder what is different in the 97 as opposed to the other year'* cyl heads to have that problem?
there is a part number change for the LATE 98 heads.....early 98 heads have the same issues

Quote:
GM used smaller valvespring pilot seats and the heads were prone to cracking at these locations
here is a good read that explains everything
http://www.3800pro.com/forum/showthread.php?t=11
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Old 01-24-2007, 07:41 AM   #10
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Quote:
Originally Posted by 1993 SLE

here is a good read that explains everything
http://www.3800pro.com/forum/showthread.php?t=11
That was interesting. That'* the first I've been there!
So what about 95-96 motors? Should we worry??
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