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Old 10/01/2017, 11:04 AM   #1
retroman99
 
If you're not living on the Edge you're taking up too much room

Location: Redondo Beach, CA
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Stock 289 Exhaust manifolds

I have a question on the configuration of the exhaust manifolds. my search for a date correct set continues. I keep seeing sets with little notches machined next to the exhaust ports which I assume is for the smog ports. if my car did not have the smog equipment should I be searching for ones without this clearance. it seems every set I find with a late 67 or very early 68 all have this clearance. any help would be appreciatted
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Old 10/01/2017, 01:36 PM   #2
gtcs1
 

Location: Quebec, Canada
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If I can help, Do you have picture of these notches. I could compare with my car, with a 289, that didn’t have smog.

gtcs1

1968 GT/CS - Highland Green - C Code 289
1973 Mustang Convertible - Bright Green Gold Metallic - H Code 351-2V
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Old 10/01/2017, 02:04 PM   #3
Mosesatm
 
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It's my understanding that starting in 1966 all small block heads had the notches.
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Old 10/01/2017, 08:10 PM   #4
retroman99
 
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Quote:
Originally Posted by gtcs1 View Post
If I can help, Do you have picture of these notches. I could compare with my car, with a 289, that didnít have smog.

gtcs1
see the attached picture with the clearances circled in red
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Old 10/02/2017, 08:36 AM   #5
CougarCJ
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The intent of the notches was for the thermactor smog system. I find them on non smog engines too. It is getting tough to find a pit free, set of exhaust manifolds.

Scott Behncke
1968 GT/CS 302-4V Honors flysis income beezis onches nobis inob keesis
West Coast Classic Cougar A good source for Mustang mechanical parts too.
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Old 10/02/2017, 03:33 PM   #6
gtcs1
 

Location: Quebec, Canada
Joined: Jun 06
Posts: 308

Quote:
Originally Posted by retroman99 View Post
see the attached picture with the clearances circled in red
Checked my car, 289 auto, all original, built in april, those clearances notches are present on both sides, exactly as you show them. I can see them from the top, FWD of the port on the LH side and AFT of the ports on the RH side,

gtcs1

1968 GT/CS - Highland Green - C Code 289
1973 Mustang Convertible - Bright Green Gold Metallic - H Code 351-2V
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Old 10/02/2017, 07:52 PM   #7
retroman99
 
If you're not living on the Edge you're taking up too much room

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thank you this helps a lot
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Old 10/02/2017, 09:59 PM   #8
robert campbell
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I have two early manifolds without notches if you want them. Free and you pay for shipping.

Rob
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Old 10/03/2017, 09:32 AM   #9
retroman99
 
If you're not living on the Edge you're taking up too much room

Location: Redondo Beach, CA
Joined: Mar 03
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Quote:
Originally Posted by robert campbell View Post
I have two early manifolds without notches if you want them. Free and you pay for shipping.

Rob
Rob that is a great offer thank you. I like the idea of no notches as it seems it would allow for more surface area around the port and less prone to leaks. ill send you a PM
thank you Brad
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