Author Topic: swap HiPo manifolds for correct 68 GT350 manifolds  (Read 677 times)

Corey Bowcutt

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swap HiPo manifolds for correct 68 GT350 manifolds
« on: March 30, 2020, 05:00:10 PM »
The exhaust manifolds that came in a box (came with SST headers on the car) with my car are C7ZE-9430 A and 9431 A which I thought were for my car.  Come to find out these appear to be HiPo exhaust manifolds so clearly not for my 1968 GT350.  So I would like to trade these for correct manifolds for my February 68, 4 speed GT350.  They look to me to be in very good condition but I am by no means an expert in fact very much a novice.  Let me know if there is any interest.  In reality I will probably never swap out the headers because the car runs so well but I like to know I have the correct manifolds should I ever want to.

KR500

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Re: swap HiPo manifolds for correct 68 GT350 manifolds
« Reply #1 on: March 30, 2020, 05:48:09 PM »
Cory
Beware that although all 1968 GT 350's and for that matter all 302 J code engines exhaust manifolds have the same casting numbers 4 speed cars have an additional machining so the air tube fittings have more clearance to the manifold. As A/T cars use the IMCO emission system and therefore no smog pump/air tubes they do not have this additional machining in the flange area.
Rodney
Rodney Harrold,Ohio SAAC Rep,SAAC 68 Shelby Concourse Judge,68 GT500KR 02267

Corey Bowcutt

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Re: swap HiPo manifolds for correct 68 GT350 manifolds
« Reply #2 on: March 30, 2020, 07:56:47 PM »
Thank you Rodney.  I learn new stuff literally every day.

Royce Peterson

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Re: swap HiPo manifolds for correct 68 GT350 manifolds
« Reply #3 on: March 31, 2020, 11:49:32 AM »
Also they have date codes so it will not cost anything extra to find the right ones the first time. Lots of them on eBay usually. I would buy the Lo - po 302 manifolds and then list yours for sale. Yours are worth a lot more than the correct ones.

Thank you Rodney.  I learn new stuff literally every day.
1968 Cougar XR-7 GT-E 427 Side Oiler C6 3.50 Detroit Locker
1968 1/2 Cougar XR-7 428CJ Ram Air C6 3.91 Traction Lock

Corey Bowcutt

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Re: swap HiPo manifolds for correct 68 GT350 manifolds
« Reply #4 on: March 31, 2020, 12:02:29 PM »
Royce,

Thank you for that.  I actually suspected that was the case.  I guess I should do some homework.

Corey

JD

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Re: swap HiPo manifolds for correct 68 GT350 manifolds
« Reply #5 on: April 01, 2020, 12:56:07 PM »
IIRC the exhaust manifolds you have may also be correct for later '67 GT350's (wider user range than just '68's), the earlier cars used C3 and a C4 identified parts but later cars used the C7 parts, not sure when the change occurred (time) and others will know better.
« Last Edit: April 01, 2020, 12:59:05 PM by JD »
'67 Shelby Headlight Bucket Grommets http://www.saacforum.com/index.php?topic=254.0
'67 Shelby Lower Grille Edge Protective Strip http://www.saacforum.com/index.php?topic=1237.0

Corey Bowcutt

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Re: swap HiPo manifolds for correct 68 GT350 manifolds
« Reply #6 on: April 01, 2020, 01:04:24 PM »
The history of the motor in my car is a bit of a mystery.  The block has a date code of August 67.  I have no idea if these exhaust manifolds came on that engine originally or not?  When I bought the car it had headers and the PO provided a box of parts including these manifolds.

Royce Peterson

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Re: swap HiPo manifolds for correct 68 GT350 manifolds
« Reply #7 on: April 04, 2020, 01:37:15 PM »
An August '67 casting would be likely for a '68 model year car. What's the assembly date stamp on the block and what is the build date of the car?

The history of the motor in my car is a bit of a mystery.  The block has a date code of August 67.  I have no idea if these exhaust manifolds came on that engine originally or not?  When I bought the car it had headers and the PO provided a box of parts including these manifolds.
1968 Cougar XR-7 GT-E 427 Side Oiler C6 3.50 Detroit Locker
1968 1/2 Cougar XR-7 428CJ Ram Air C6 3.91 Traction Lock

KR500

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Re: swap HiPo manifolds for correct 68 GT350 manifolds
« Reply #8 on: April 04, 2020, 05:57:51 PM »
An August '67 casting would be likely for a '68 model year car. What's the assembly date stamp on the block and what is the build date of the car?

The history of the motor in my car is a bit of a mystery.  The block has a date code of August 67.  I have no idea if these exhaust manifolds came on that engine originally or not?  When I bought the car it had headers and the PO provided a box of parts including these manifolds.
Regardless of the date codes of exhaust manifolds in Cory's photos they are not a factory application for a 68 302 J code Mustang/Shelby
Rodney Harrold,Ohio SAAC Rep,SAAC 68 Shelby Concourse Judge,68 GT500KR 02267