Topic: 67 GT500 Thermactor questions

[2112]

Did a search and found an old thread with some Thermactor questions on 67' big blocks. One mentioned that the smog tubes (manifolds) were being reproduced.

I have seen 68' reproductions but I have yet to find them for 67's. Anyone here have that source, or any source for 67' thermactor parts?

This is the post I am using as my initial parts collecting guide;

Four in each head when an owner removes the tubes or an owner uses the heads on a non-thermactor car.


The 67 engine assembly manuals have a number of drawings of the system though there are a few little differences between those and how the cars were built it would give you a starting point


Not easy to show a complete system since one in the car there is allot of other things in the way. Complete system has to have about three dozen parts or more.

Big pieces off the top of my head

1- Thermactor tubes - two of them one drivers one passenger side - both reproduced (with 16 attaching pieces)

2- Two check valves (one for each thermactor tube)

3- Thermactor pump (66-67 style) with correct pulley for your application

4- Alternator and thermactor pump mounting bracket   with two adjusting area (different depending on time of year)

5- Thermactor air cleaner - attaches to pump - Style and where it mounts depends on time of year

6- two port gulp valve and mounting bracket - attaches to the rear of the intake manifold

7- Various hoses, clamps, and other hardware depending on if the car has air conditioning and other features.

Can't remember if the distributor changes but the carburetor does (from the non- Thermactor applications

[J_Speegle]

Did a search and found an old thread with some Thermactor questions on 67' big blocks. One mentioned that the smog tubes (manifolds) were being reproduced.

Like many reproductions they are sometimes not exact or like originals - Checked NPD quickly and their listed there as a part they carry  Listed under 67-70 thermactor/Smog tubes. WCC only list used one that they show out of stock at this time.

Mansfield mustang sells a 67-68 version and a 68-70 version. Basically the front support bracket is shaped differently.

Since you will be removing that for your application not sure if it makes a difference   but the other difference in all these reproduction tubes is where cylinder #5 injector tube comes off (location and direction) of the main drivers side feeder. With that in mind the one they have listed as 66/67 is IMHO the closest of the group to what a 67 390 Mustang would have looked like

[Bob Gaines]

Like many reproductions they are sometimes not exact or like originals - Checked NPD quickly and their listed there as a part they carry  Listed under 67-70 thermactor/Smog tubes. WCC only list used one that they show out of stock at this time.

Mansfield mustang sells a 67-68 version and a 68-70 version. Basically the front support bracket is shaped differently.

Since you will be removing that for your application not sure if it makes a difference   but the other difference in all these reproduction tubes is where cylinder #5 injector tube comes off (location and direction) of the main drivers side feeder. With that in mind the one they have listed as 66/67 is IMHO the closest of the group to what a 67 390 Mustang would have looked like

No one is reproing a correct 67 BB thermactor tube at this time. To add to Jeff's post there is a 67 style a 68 style and a later 68 -69/70 style for a total of 3 . Besides the straps as Jeff pointed out they all have differences in the tube dimensions where the tube comes up from the manifold and bends over across the front of the engine. I will post a picture with the 67 version to the far right. If you look at the shoe of the person standing you can take a wild guess at who laid these out for me to take a picture of and badgering me the whole time.

[2112]

So this is what I am commonly finding out there in the market place. This pair was reported to have been personally removed from a 67' 390 Cougar. It is the tube that swings out front that Bob is mentioning and showing that I never seem to find. In pictures of restored cars, it is in THAT tube that the check valves are incorporated in. The tubes I am showing has check valves on the manifolds themselves.   

[2112]

Also, since I have the help of 2 experts, if my car left Ford SJ plant in the first week of Feb, 1967, would a smog pump dated early 1966 be out of the question? I have been told the block and heads should be about 6-8 weeks older than the car, but I wondered about ancillary pieces like pumps, pulleys etc.

Thanks for your help

[Bob Gaines]

So this is what I am commonly finding out there in the market place. This pair was reported to have been personally removed from a 67' 390 Cougar. It is the tube that swings out front that Bob is mentioning and showing that I never seem to find. In pictures of restored cars, it is in THAT tube that the check valves are incorporated in. The tubes I am showing has check valves on the manifolds themselves.   

The ones in the pictures are the driver side and the short one with the valve done close to the head at the back/firewall side is the passenger side these are the ones used on a 67 GT500. The other BB style which was not used on any Shelby had both sides with the valve down low by the head.  The last person that I had looking for some I directed to ED Meyer (Special ED) . I don't know if he has anymore as he only cares about 69/70 cars 

[2112]

So that big tube that runs out front is a separate piece that connects to these manifolds? I could use pictures, but it appeared as though the big tube was part of the driver's side manifold.

I will ask Ed if he has anything left over. Thanks Bob.

[J_Speegle]

So this is what I am commonly finding out there in the market place. This pair was reported to have been personally removed from a 67' 390 Cougar. It is the tube that swings out front that Bob is mentioning and showing that I never seem to find.

Those are not tubes that were typically used on San Jose built Cougar and Mustang 67's at least that I've ever seen, owned or seen in pictures.

That style was used on T birds, Galaxies, trucks and the like as shown in the Ford drawing




67 big block pipes look like these originals (Cougar and Mustang examples)







 

In pictures of restored cars, it is in THAT tube that the check valves are incorporated in. The tubes I am showing has check valves on the manifolds themselves.   

The check valves screw on to the end of each of the tube manifolds. They are a separate piece

Also, since I have the help of 2 experts, if my car left Ford SJ plant in the first week of Feb, 1967, would a smog pump dated early 1966 be out of the question?

IMHO yes one year is a stretch and would be out of the norm

The ones in the pictures are the driver side and the short one with the valve done close to the head at the back/firewall side is the passenger side these are the ones used on a 67 GT500. The other BB style which was not used on any Shelby had both sides with the valve down low by the head.  The last person that I had looking for some I directed to ED Meyer (Special ED) . I don't know if he has anymore as he only cares about 69/70 cars 

Might want to look at the bottom one again  - looks to be a T bird pipe/manifold since check valve is located at the front of the engine behind the pump. Give away is the way the smaller secondary tubes are shaped 



His bottom tube compared to the curvature of an original with the check valve at the rear.  Real easy to miss when the parts are off the car just sitting there

[2112]

Jeff,

Do you have a schematic like the one above for Mustangs?

[J_Speegle]

Jeff,

Do you have a schematic like the one above for Mustangs?

No the MPC I have with the somewhat generic drawings do not have the 67 Mustang application - only big Ford (390-428) , Fairlane (390)  and the PI (427) for 67 big block applications. Interesting that they included the 67 289 Hipo drawing since its a 4 month only thing

Do have have some home made drawings for the routing of hoses and such (what connects to what)

But do remember the Shelby GT500 system will be different from a stock Mustang system so the one above might be as much help

Some of the regular 390 Mustang parts were replaced with other parts, specific Shelby parts and some were modified. Also you would need to focus on what was being done during your cars built period and a generic drawing would not reflect all of these. differences

Here is a general shot of the parts that make up the system - again some will not be used if you have a car built during certain times. Note:

- that the drivers side manifold is not the correct one for the application

- the picture does not show the pump, pulley or any of the mounting bolts.

- There are three large diameter hoses missing and the small rubber vacuum hose not shown

- And that is NOT a factory paint mark on the diverter valve


Guess I should get it all out again and take a complete shot of all the pieces for a better reference picture

[67gtasanjose]

Jeff,

Do you have a schematic like the one above for Mustangs?

I have that schematic, but I see at least two versions 11/66, and 2/67 revsion for some of the hose routngs

[Bob Gaines]

I have that schematic, but I see at least two versions 11/66, and 2/67 revsion for some of the hose routngs

Those schematics will not help for a GT500 application because the installer would have to know what things are for GT500 and what aren't . a catch 22.  It would be helpful for someone like myself to remind which way a few of the clamps are positioned but that would be it. Not anything in print on the GT500 that is much help. We have to go by personal observations mostly. 

[Bob Gaines]

No the MPC I have with the somewhat generic drawings do not have the 67 Mustang application - only big Ford (390-428) , Fairlane (390)  and the PI (427) for 67 big block applications. Interesting that they included the 67 289 Hipo drawing since its a 4 month only thing

Do have have some home made drawings for the routing of hoses and such (what connects to what)

But do remember the Shelby GT500 system will be different from a stock Mustang system so the one above might be as much help

Some of the regular 390 Mustang parts were replaced with other parts, specific Shelby parts and some were modified. Also you would need to focus on what was being done during your cars built period and a generic drawing would not reflect all of these. differences

Here is a general shot of the parts that make up the system - again some will not be used if you have a car built during certain times. Note:

- that the drivers side manifold is not the correct one for the application

- the picture does not show the pump, pulley or any of the mounting bolts.

- There are three large diameter hoses missing and the small rubber vacuum hose not shown

- And that is NOT a factory paint mark on the diverter valve


Guess I should get it all out again and take a complete shot of all the pieces for a better reference picture

The alternator adjusting bracket is not correct for GT500 application. The correct one has a another bend to clear the large diameter GT500 /police intercepter balancer.

[2112]

I have that schematic, but I see at least two versions 11/66, and 2/67 revsion for some of the hose routngs

The Manifolds I pictured seem to fit the behind the carb routing on the upper left but I am guessing my 2/67 car is actually the in front of the distributer routing shown down on the lower right.

Thanks for posting that and Thank you Jeff for the pictures. Helps to see what I am looking for.

[Bob Gaines]

Quote from: Bob Gaines on Today at 03:18:03 PM

The ones in the pictures are the driver side and the short one with the valve done close to the head at the back/firewall side is the passenger side these are the ones used on a 67 GT500. The other BB style which was not used on any Shelby had both sides with the valve down low by the head.  The last person that I had looking for some I directed to ED Meyer (Special ED) . I don't know if he has anymore as he only cares about 69/70 cars 





Might want to look at the bottom one again  - looks to be a T bird pipe/manifold since check valve is located at the front of the engine behind the pump. Give away is the way the smaller secondary tubes are shaped 



His bottom tube compared to the curvature of an original with the check valve at the rear.  Real easy to miss when the parts are off the car just sitting there

My comments were in reference to the long tubes in the picture that I posted not another. The short one I write about is not in the picture but just a written description.