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Old 04-22-2010, 07:36 AM   #1
snowbird
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Default 250 inline 6 manifold question

I need help finding a manifold for a 250 inline 6. Haven't had any lucky when I google it. I believe its what you call a split maifold. Part of it is made on the head and the other half bolts to it. Wondering if I could replace the head with a different one? Any help or advice I would appreciate.......by the way cool forum....

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Old 04-22-2010, 07:46 AM   #2
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Default Re: 250 inline 6 manifold question

Not sure I understand what you are looking for. A split manifold is an exhaust manifold that would keep the spent gas from 3 cyliders separated from the the spent gas from the other 3 cylinders either by using two manifolds or having a partition in the casting of a single manifold.
It sounds like you might have a cylinder head with an integral intake manifold built to meet smog regulations. I think you can swap this for an older non smog head without modifying the block.
Got a photo ? that always helps.
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Old 04-22-2010, 08:04 AM   #3
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Default Re: 250 inline 6 manifold question

Intake is formed to the head and exhaust comes off. Here is a pic of one similiar...amplizine.com/featured/gm-250-cid-inline-6-an...
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Old 04-22-2010, 08:12 AM   #4
29nash
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Default Re: 250 inline 6 manifold question

Quote:
Originally Posted by snowbird View Post
Intake is formed to the head and exhaust comes off. Here is a pic of one similiar...amplizine.com/featured/gm-250-cid-inline-6-an...
..........reading between the lines, sounds like you might want the exhaust manifold for the 250 with the integrated head.

If not, figure out what it is that you want and enlighten us. A picture of your setup would be a great help. Anyhow, take a look at this, even if it don't fit your needs it'll be a short start on educating yourself with the differences................

http://cgi.ebay.com/ebaymotors/4-1-2...item3a59c3c832

Click image for larger version

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Old 04-22-2010, 09:41 AM   #5
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Default Re: 250 inline 6 manifold question

I'll get a picture from home and post it, it came off a 79' chevy scottsdale. Thanks..I'll be back.
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Old 04-22-2010, 10:22 AM   #6
THE FRENCHTOWN FLYER
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Default Re: 250 inline 6 manifold question

Some manufacturer - I think Nash - also did have an integral intake manifold where the top half that contained the carb mounting flange was fastened to the lower half of the intake. But I don't think any 250 Chev is like that.
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Old 04-22-2010, 11:52 AM   #7
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Default Re: 250 inline 6 manifold question

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I'll get a picture from home and post it, it came off a 79' chevy scottsdale. Thanks..I'll be back.
not sure if it's the same motor that came factory, but the sticker under the hood says 250 4.1 liter
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Old 04-22-2010, 12:09 PM   #8
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Default Re: 250 inline 6 manifold question

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Originally Posted by THE FRENCHTOWN FLYER View Post
Some manufacturer - I think Nash - also did have an integral intake manifold where the top half that contained the carb mounting flange was fastened to the lower half of the intake. But I don't think any 250 Chev is like that.
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Old 04-22-2010, 12:41 PM   #9
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Default Re: 250 inline 6 manifold question

Your intake is actually part of the cylinder head, and the exhaust manifold bolts onto the bottom of the intake part of the head. If the "intake" is cracked, you need to replace the whole cylinder head.

You can convert the engine over to a more traditional cylinder head with separate intake and exhaust manifolds. You just need to find an older head and manifolds. 194/230/250/292 heads all interchange. When getting manifolds, Just be aware of where the exhaust outlet is, as not all of them were the same.
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Old 04-22-2010, 12:48 PM   #10
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Default Re: 250 inline 6 manifold question

Clifford. I've had their stuff on two of my sixes.

www.cliffordperformance.net
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Old 04-22-2010, 01:40 PM   #11
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Default Re: 250 inline 6 manifold question

29nash is right. It is and integrated head. Can be swapped for and earlier 250 head. What you have is part of the exhust manifold is cast in the head. Lots of problems for me when I had one. Swapped out for and earlier head and used a 292 truck 3 bolt at flange manifold. Larger flow and 3 bolt, car manifolds used 2 bolt flanges. Been there, done that and still have the parts. PS make sure to get a head with hardened valve seats or have them installed when you have the head at the machine shop.
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Old 04-22-2010, 01:44 PM   #12
pasadenahotrod
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Default Re: 250 inline 6 manifold question

Those integrated inline six heads are junk. The junkyard guy told me if you ever let 'em get hot they're history. Cracks right across the crown of the combustion chambers in #2, #3, #4, told me he wasn't kidding. Then he told me used heads had a waiting list. I sold the car to my neighbor who turned it into a V8 car and drove it for the next 10 years.
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Old 04-22-2010, 04:38 PM   #13
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Default Re: 250 inline 6 manifold question

Click image for larger version

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Whatever the case if your head looks like this^


Even though you lose about 15 hp, it's better to junk it and get one like this. Click image for larger version

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You can buy a rebuilt one for about $250, they are fairly plentiful.

Of course, then you will also need different manifolds. There are a couple of aftermarket options, clifford and offenhauser that work, or the stock manifold for the one barrell Rochester.

Last edited by 29nash; 04-22-2010 at 04:44 PM.
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Old 04-23-2010, 05:23 AM   #14
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Default Re: 250 inline 6 manifold question

Thanks everyone for the replies...29NASH right on the money. Do I just search rebuilt head for inline 6 250.
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Old 04-23-2010, 08:43 AM   #15
29nash
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Default Re: 250 inline 6 manifold question

snowbird; sending pm
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Old 04-23-2010, 09:09 PM   #16
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Default Re: 250 inline 6 manifold question

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Originally Posted by snowbird View Post
Thanks everyone for the replies...29NASH right on the money. Do I just search rebuilt head for inline 6 250.

I don't remember if it's Patricks or Langdons that sells rebuilt late model style 194, 215, 230, 250, 292 cyl.inder heads for a very good price. I gave all my catalogs away when we went the V-8 route. Maybe someone else here has one of the catalogs and can elaborate. Butch/56sedandelivery.
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Old 05-08-2010, 05:39 PM   #17
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Default Re: 250 inline 6 manifold question

Like a dumbass I just pulled my parts truck out and realized the engine HAS an integrated head! ARGHHH!@@@#@

Now I am looking for a head.
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Old 05-08-2010, 05:53 PM   #18
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Default Re: 250 inline 6 manifold question

Tman,

Here you go buddy. http://www.rockauto.com/catalog/x,ca...,parttype,5304
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Old 05-08-2010, 09:56 PM   #19
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Default Re: 250 inline 6 manifold question

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Thanks, them and Napa are damn proud of them tho. I will start looking locally. My engine is a good runner so I can bide my time until I run across one. I was really bummed out when I realized that this afternoon. Was ready to scrap the inliner altogether, then I ran it through my head. Went out to eat for Mothers Day and I am good with it.
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Old 05-08-2010, 10:48 PM   #20
bob308
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Default Re: 250 inline 6 manifold question

another way to do it is to machine the intake off then make your own intake and exhaust. that way you have a 12 port head on the 6. another way is to cut the end cylander off of 2 sbc heads and weld them together. that makes a killer head for the 6. i have a pair of zz1 heads that lost a valve and luck would have it they are the ones that get cut off.
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