Topic: 1967 GTA 390 thermactor system

[travnemi]

Jeff I had questions on this tube, you wrote;

-Doesn't look like the small diameter steel hose is long enough to reach the front of the engine. It normally reaches to the area just in front of the carb on the passenger side then attaches with a rubber hose to that vacuum block at the front of the intake. Might be from a small block application.

I have a longer tube but it has threaded brass fittings on both ends. The tube doesn't connect to the back at the base of the carburetor?

Thanks,
Travis

[J_Speegle]

Jeff I had questions on this tube, you wrote;

-Doesn't look like the small diameter steel hose is long enough to reach the front of the engine. It normally reaches to the area just in front of the carb on the passenger side then attaches with a rubber hose to that vacuum block at the front of the intake. Might be from a small block application.

I have a longer tube but it has threaded brass fittings on both ends. The tube doesn't connect to the back at the base of the carburetor?

The small vacuum tube you have is likely from a small block or other application. vacuum source is the vacuum block located at the front of the intake (one the U or Y shaped steel vacuum tube screws into as shown below. Connects at that end with a short piece of rubber hose. Its also formed with the typical (like used in early dist vacuum steel lines) That loop is shown in the earlier picture of the unrestored example






So

Yellow arrow - Rubber vacuum hose connecting long thin steel line from the back tire valve to vacuum block attached to the intake

Blue arrow - Big steel tube/line connecting front and rear intake vacuum connections and the PCV nipple

Green arrow - Long thin steel line from the back tire valve

Red arrow - A very rare (only seen a couple) sheetmetal clamp that was designed to hold the thin and large vacuum lines together. In the picture the clip has fallen/moved off of the large steel tube

[travnemi]

Sweet thanks Jeff!!!!
The sheet metal clamp was like a S shape clamp?

ThNks
Travis

[travnemi]

Thanks Jeff!!

Here's another question, are the bolts correct on the Anti back fire valve back fire valve bracket in the picture below.

[J_Speegle]

Sweet thanks Jeff!!!!
The sheet metal clamp was like a S shape clamp?

Believe so - as mentioned - don't think I've ever seen one in person

Here's another question, are the bolts correct on the Anti back fire valve back fire valve bracket in the picture below.

Merged this post with the other related ones

All four bolt finishes should match

And what is the "strings" under the intake mounting bolts?

[travnemi]

Ok here I go again!!

I just received some part for the thremactor system. Before I go crazy painting, I just want to make sure I'm painting the right hoses and fittings. I placed arrows where I believe paint would go(I don't have any spring clamps on there yet, and they get painted too). The hose I'm really not sure about is the one that goes between the anti back fire valve and the pcv T.

Thanks for the help

[J_Speegle]

No paint on the hose from the T to the back fire valve - those hoses were not in place when the engine was painted


IMHO The wire clamps on all those other hoses (PCV vacuum hoses)  is a question since not all original engines show evidence of ever having clamps on that side but others do.  Same goes for the short hose between the metal "Y" and the rear vacuum block

Paint on the vacuum/PCV hose and fittings can fade out anywhere along the hoses and fittings after the attachment point of the metal "Y"

Why we're looking at that side of the engine - are the valve cover gaskets silver painted cork ones?

[travnemi]

Yes they are, I'm hoping the staples are ok?
Is the engine tag in the right location?
Also, I included some corrections on the carburetor.
Question on the hose between the oil fill cap and the air cleaner. Is it a straight or the one I have in the picture?

Your thoughts on on the pics

[Bob Gaines]

Yes they are, I'm hoping the staples are ok?
Is the engine tag in the right location?
Also, I included some corrections on the carburetor.
Question on the hose between the oil fill cap and the air cleaner. Is it a straight or the one I have in the picture?

Your thoughts on on the pics

Accelerator pump arm should be black oxide .Screw and nut are silver . Fuel filter should be zinc dichromate gold with the C7 sticker. Your engine is way too early to have a oil cap with the FOMOCO in block letters in the rectangle. It should have the one with the Ford in script in the oval. If I were guessing which I am I would guess that the hose from the oil cap was not a molded one . 

[J_Speegle]

To expand on Bob's descriptions and great help

Carb details

As Bob mentioned the accelerator arm was a black oxide (dark) (Red arrow)

The upper vent parts would have been zinc dicromate (Gold arrows)

Accelerator adjusting hardware would have been zinc (Green arrow) Have seen the springs in zinc, dichromate and dyed colors but the colored ones were on later and service replacements

As would the secondary arm and primary shaft - zinc (Green arrow)

Also (no arrow) the screw holding the secondary cam would have been zinc

Just can't do everything in one finish like many carburetor restorers do






Loose (remove and paint over) the 2014 date on the bottom of the coil - it is facing forward for everyone to see





Vent hose would not have that number on it and would be straight as shown in the other group of pictures

[Bob Gaines]

To expand on Bob's descriptions and great help

Carb details

As Bob mentioned the accelerator arm was a black oxide (dark) (Red arrow)

The upper vent parts would have been zinc dicromate (Gold arrows)

Accelerator adjusting hardware would have been zinc (Green arrow) Have seen the springs in zinc, dichromate and dyed colors but the colored ones were on later and service replacements

As would the secondary arm and primary shaft - zinc (Green arrow)

Also (no arrow) the screw holding the secondary cam would have been zinc

Just can't do everything in one finish like many carburetor restorers do

spring on bowl vent arm would be black oxide too.

[J_Speegle]

spring on bowl vent arm would be black oxide too.

A 67 thing? - seeing non- dark ones on 68's and 69 examples

[Bob Gaines]

A 67 thing? - seeing non- dark ones on 68's and 69 examples

I suppose a better worded description would be spring steel and  not gold as the as all of the surroundings in the picture are.

[travnemi]

Red arrow - A very rare (only seen a couple) sheetmetal clamp that was designed to hold the thin and large vacuum lines together. In the picture the clip has fallen/moved off of the large steel tube

Do you have any better pictures of the  sheet metal clamp?

[J_Speegle]

Do you have any better pictures of the  sheet metal clamp?

There is a simple drawing in the assembly manual but I've never seen or found one still on a system other than the one shown in the picture. If I did (20 or more years ago)  I tossed it not realizing  what it was