Replacing XR7-G dual exhaust - 390GT

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propayne
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Re: Replacing XR7-G dual exhaust - 390GT

#11

Post by propayne » 03 Jan 2017, 14:12

More advice please - I am getting ready to order my exhaust from NPD and their catalog says that the H-pipe is 2" on Cougars before 12/11/67 and 2 1/4" on Cougars from 12/11/67.

I'm pretty sure I need the 2" but my G was produced on May 6, 1968 and I want to make sure I am ordering the correct pieces.

Attached are some photos of the exhaust manifolds that are now on my engine.

So which H-pipe do I order?

- Phillip
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Re: Replacing XR7-G dual exhaust - 390GT

#12

Post by 1969XR7Vert » 03 Jan 2017, 14:19

Royce wrote:I've done the weld - a - bolt - to - the - muffler thing several times without owning a welder. I put marks on the mufflers where I wanted the bolts, and handed the mufflers and the bolts to the muffler shop guy. He's got a welder.
I made stainless steel sheet stock "U" shapes with the proper sized hole so that a 5/16" self-threading bolt would cut its own threads into it. I welded those to my Magnaflow stainless mufflers. This exactly emulates the stock muffler mountings as I recall.

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You can see one of the U-shapes in the right of this photo:

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Isabel, the realization of a seven year long dream:



Canted--Texan on the351cforum: "One of my most impressive attributes is that.......a lot of people don't like me.....or the horse I rode in on"

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Re: Replacing XR7-G dual exhaust - 390GT

#13

Post by Royce » 03 Jan 2017, 16:37

Measure the round hole in the manifold. If they truly make one that fits in 2 1/4" then that sounds like what you wanted.

The big change was replacing the RH exhaust manifold heat valve on the early 390GT's with a spacer on the rest of the '68 model year cars. I was unaware a change of diameter happened.
propayne wrote:More advice please - I am getting ready to order my exhaust from NPD and their catalog says that the H-pipe is 2" on Cougars before 12/11/67 and 2 1/4" on Cougars from 12/11/67.

I'm pretty sure I need the 2" but my G was produced on May 6, 1968 and I want to make sure I am ordering the correct pieces.

Attached are some photos of the exhaust manifolds that are now on my engine.

So which H-pipe do I order?

- Phillip
1968 GT-E XR-7 W code 427 Augusta Green / Saddle
1968 XR-7 R code 428CJ Ram Air Red / Black
1910 Model T Ford Touring Red / Black
1914 Model T Touring Maroon / Black
1915 Model T Ford Touring Black / Black
1917 Model T Ford Torpedo Runabout Green / Black
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propayne
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Re: Replacing XR7-G dual exhaust - 390GT

#14

Post by propayne » 03 Jan 2017, 17:23

Thanks Royce -

I've been doing more checking and I think that the ordering info in the catalog is misleading. I think all '68 390GT exhaust manifolds are 2" and that the early/late change they are talking about only applies to the heat valve you mentioned.

- Phillip

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Re: Replacing XR7-G dual exhaust - 390GT

#15

Post by hipo65 » 17 Feb 2018, 10:17

Phillip, did you end up getting the NPD exhaust system and if so how did it fit? Has anyone else installed the 390 exhaust system from Waldon's or WCCC and how do they fit?

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Re: Replacing XR7-G dual exhaust - 390GT

#16

Post by propayne » 17 Feb 2018, 20:18

Yes, I had some time constraints so the easiest and quickest thing to do was order the full exhaust system from NPD.

I delivered the Cougar and exhaust plus all the hangers, clamps, etc. to the muffler shop and when I picked it up the technician said he had a few fitment issues and had to do some finessing and welding. But he was able to install in in a couple of hours.

I've put about 600 miles on her since and so far so good.

- Phillip

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1967 S Code
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Re: Replacing XR7-G dual exhaust - 390GT

#17

Post by 1967 S Code » 18 Feb 2018, 14:17

propayne wrote:
17 Feb 2018, 20:18

I've put about 600 miles on her since and so far so good.

- Phillip
How about some pictures Philip. I’m interested in seeing the Coral Gables “G” all spruced up.
Steven
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Our Cougars

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1967 Standard
Dan Gurney Special

6.5 Litre, Black / Black, AC Whisperaire, Am/FM, Sports Console,
Front and Rear Bumper Guards, Clock

1968 XR7-G
302 4V, Lime Frost / Black Leather, AM/FM, Black Vinyl, Tilt-A-Way
Heavy Duty Suspension, Power Disc Brakes, Rader Wheels


1968 XR7-G Hertz
390 4V, Black Cherry/ Dark Red Leather, Black Vinyl, Sunroof, Tilt-A-Way,
Cruise, Rear Defrost, AC Whisperaire


1968 Convertible Conversion "Top Cat"
Standard, 302 4V, XR7G Console, XR7G Front Valance, XR7S Taillight Bars

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propayne
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Re: Replacing XR7-G dual exhaust - 390GT

#18

Post by propayne » 18 Feb 2018, 14:34

I would really love to find some more stuff from that Coral Gables Mercury dealership.

I may have posted these, not sure - but here a few more pics.

Running real well now (knocks on wood).

- Phillip
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Re: Replacing XR7-G dual exhaust - 390GT

#19

Post by xr7g428 » 19 Feb 2018, 15:42

I am loving this! Great job!
Bill Basore, Editor / Publisher
Legendary Cougar Magazine
Currently in the Cat House
'67 XR7 GT 390 4 speed, AC, AM FM, Lime Frost Green
'68 XR7-G 428CJ C6, Tilt-Away, AM, Black Cherry
'68 XR7-G 390 4 speed, Sunroof, Cardinal Red
'68 XR7 GT-E 427 C6 AM Cardinal Red
'68 XR7 resto mod 351W, soon to be AOD, Black Cherry

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Re: Replacing XR7-G dual exhaust - 390GT

#20

Post by propayne » 19 Feb 2018, 17:46

Thanks Bill - I'm really enjoying the process.

- Phillip

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