3.8 heads--- are the SC and N/A'd the same head? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-26-2006, 08:15 PM   #1
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Default 3.8 heads--- are the SC and N/A'd the same head?

Hello,
I need to know if the SC and NA heads are the same. I have a 1992 SSEi that needs the rear head. Looking for a SC motor is more difficult and the others are a dime a dozen. are they the same? thanks
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Old 07-26-2006, 08:17 PM   #2
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Read this tech info article on the 3800 N/A and */C. It'* been discussed before.

http://www.bonnevilleclub.com/forum/...e=article&k=31
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Old 07-26-2006, 08:21 PM   #3
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Short answer:

No.

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Old 07-26-2006, 08:26 PM   #4
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Quote:
Originally Posted by big_news_1
Short answer:

No.

what about the long answer, what are the differences? The part numbers for valves are the same. the only difference I can find is the head gasket for the SC is different (assuming different for the different compression pistions and the need for the higher pressure in the combustion chamber)
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Old 07-26-2006, 08:32 PM   #5
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I'm seeing 2 different part #'* for the cylinder heads on the N/A and the */C versions.

*/C=24501418
N/A=24508132

I'm sure one of the GH'* will pop in and give a more detailed explanation. I for one, do not have a */C and this is all I can tell you.
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Old 07-26-2006, 08:33 PM   #6
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I'm not familiar with the Series 1 motor, but in the Series 2 the injector bosses are in the heads for the supercharged models and in the lower intake for the normally aspirated models. I believe the difference is the same between the Series 1 L67 and L27. The compression ratios are also different (as you mentioned). You simply cannot interchange the heads without extensive modification. You might have to do a little searching, but make sure you use the correct head.

I'm sure a more experienced member will be able to tell you which years are confirmed compatible with your '92.
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Old 07-26-2006, 08:34 PM   #7
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Default Re: 3.8 heads--- are the SC and N/A'd the same head?

Quote:
Originally Posted by jaye22
Hello,
I need to know if the SC and NA heads are the same. I have a 1992 SSEi that needs the rear head. Looking for a SC motor is more difficult and the others are a dime a dozen. are they the same? thanks
If you are simply looking to get a set of heads from a 91-92 Vin L they are the same...

You can use a set of 93-95 heads but you will need both.. These heads went to a Roller Pivot design as opposed to the Pivot for 91-92 Vin 1( SC ) and 91-92 Vin L ( NA ) heads...


Part number 24500363 was used for the 91-92 Model years was the same between the NA and SC'd models

Part Number 24501418 was used from 93-95 and the same for both NA and SC

( With the exception of the 3800 Series II which was the redesigned motor, The series II heads will not work, GM built both the Vin L and new Vin K this year-1995)

It may be easier to locate a set of 93-95 heads at this point weather NA or SC'd..

If there is any more info you need please feel free to ask

Good Luck

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Old 07-26-2006, 08:34 PM   #8
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I also see a part # difference for the intake and exhaust valves, along with...
pushrods
rocker arms
balancer shaft
cylinder head gasket
valve springs.
The list can go on....


Quote:
Originally Posted by jaye22
Quote:
Originally Posted by big_news_1
Short answer:

No.

what about the long answer, what are the differences? The part numbers for valves are the same. the only difference I can find is the head gasket for the SC is different (assuming different for the different compression pistions and the need for the higher pressure in the combustion chamber)
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Old 07-26-2006, 08:36 PM   #9
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Default Re: 3.8 heads--- are the SC and N/A'd the same head?

Quote:
Originally Posted by jr's3800
If you are simply looking to get a set of heads from a 91-92 Vin L they are the same...


Part number 24500363 was used for the 91-92 Model years was the same between the NA and SC'd models

Part Number 24501418 was used from 93-95 and the same for both NA and SC

It may be easier to locate a set of 93-95 heads at this point weather NA or SC'd..

Good Luck
Injector bosses are not in the S1 L67 heads? I guess I was mistaken. Sorry for the confusion.

Thanks for the help, Don!
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Old 07-26-2006, 08:38 PM   #10
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sorry, my bad. I was looking up a 95 and not the 92.
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