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Old 06-18-2007, 06:41 AM   #1
BarnOwl
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Default '99a or '99b?

I have an opportunity to buy yet another SW. This will make 3. I haven't been able to look at it yet but, from the description, this one has a rod knock. I have a '97 engine with what's probably an okay bottom end. My problem is that the wagon's a '99. So, if it's '99b, the bottom end won't fit. What's the easiest way to tell, just looking at the engine?

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Old 06-18-2007, 09:05 AM   #2
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Default Re: '99a or '99b?

barnowl, with the vin # you could get production date from dealer which would give you some more information to decide if its early or late.

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Old 06-18-2007, 12:53 PM   #3
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Default Re: '99a or '99b?

A 1997 engine will go into a 1999 with no problems. We have a 1999 SC2 with a 1997 engine.

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Old 06-18-2007, 01:14 PM   #4
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Default Re: '99a or '99b?

Quote:
Originally Posted by Low Saturn View Post
A 1997 engine will go into a 1999 with no problems. We have a 1999 SC2 with a 1997 engine.
You misunderstand what I'm asking. I want to put the '99 head on the '97 block. That is supposed to work for some '99s. I want to know how to tell which this one is.

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Old 06-18-2007, 01:23 PM   #5
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Default Re: '99a or '99b?

Isn't the later head the narrower one, with the cams spaced closer together? No molded "snaps" for the spark plug wires between the cam spaces on the cam cover? And isn't this also the one with a 9-stud exhaust manifold, vs. the old 5-stud? Or am I getting my transitions all mixed up?

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Old 06-18-2007, 01:35 PM   #6
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Default Re: '99a or '99b?

AFAIK that's correct. The 9 versus 5 studs on the exhaust manifold is the kind of thing I was looking for. I'd forgotten about that one. I didn't know about the molded snaps. I'll have to take a look at my SW2 to check that out. The narrower head is and cam spacing are a little hard to see just looking at the engine.

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Old 06-18-2007, 01:56 PM   #7
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Default Re: '99a or '99b?

The 1999 head, no matter which one it is will bolt up the the 1997 block. If thats what you're asking. It an hour and a half to lunch, I'm starving and not thinking clearly.

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Old 06-18-2007, 02:02 PM   #8
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Default Re: '99a or '99b?

Quote:
Originally Posted by Low Saturn View Post
The 1999 head, no matter which one it is will bolt up the the 1997 block. If thats what you're asking. It an hour and a half to lunch, I'm starving and not thinking clearly.
That I didn't know but, you are the guy that I knew would. So, I guess the narrower head didn't show up until 2000. Thanks very much.

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Old 06-18-2007, 02:10 PM   #9
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Default Re: '99a or '99b?

Quote:
Originally Posted by BarnOwl View Post
That I didn't know but, you are the guy that I knew would. So, I guess the narrower head didn't show up until 2000. Thanks very much.
I don't think that's what he means. I think he means that the block is not changed, so either the wider or narrower head will fit the '97 block. But now I'm hungry, too (LATE lunch time here in the Central TZ).

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Old 06-18-2007, 02:22 PM   #10
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Default Re: '99a or '99b?

Quote:
Originally Posted by madpogue View Post
I don't think that's what he means. I think he means that the block is not changed, so either the wider or narrower head will fit the '97 block. But now I'm hungry, too (LATE lunch time here in the Central TZ).
Yeah, thats it.

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Old 06-18-2007, 02:23 PM   #11
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Default Re: '99a or '99b?

Quote:
Originally Posted by madpogue View Post
I don't think that's what he means. I think he means that the block is not changed, so either the wider or narrower head will fit the '97 block. But now I'm hungry, too (LATE lunch time here in the Central TZ).
Forgive me for being dense but, I would think that if the head was actually narrower, it wouldn't bolt up to a block made for a wider head. I don't mind it if I'm wrong about that. I want the block to go in the '99 not in the '97. So, it works for me regardless.

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Old 06-18-2007, 02:27 PM   #12
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Default Re: '99a or '99b?

I'm oversimplifying, but -- the top of the head is narrower; less spacing between the cams. The bottom of the head is the same. Think of it this way (wavering OT): the SOHC head is way narrower than either one, and it fits the very same block.

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Old 06-18-2007, 02:41 PM   #13
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Default Re: '99a or '99b?

Quote:
Originally Posted by madpogue View Post
I'm oversimplifying, but -- the top of the head is narrower; less spacing between the cams. The bottom of the head is the same. Think of it this way (wavering OT): the SOHC head is way narrower than either one, and it fits the very same block.
Couldnt of put it better myself.

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Old 06-18-2007, 07:21 PM   #14
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Default Re: '99a or '99b?

yes the timing cover, exhaust manifold and valve cover will be different also, i think

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Old 06-22-2007, 06:37 PM   #15
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Default Re: '99a or '99b?

came across this post and thought it could help id '99 motors

Re: Torque specs Rods/Mains
These "new" rods appeared in the LATE 99' model year engines with the "improved" rods and pistons. (Look for the lovely plastic intake to identify a late 99' DOHC engine. All 00' ~ 02' have these rods...., wolfman

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