Thanks Charlie.

After hearing from NoShortcuts Charlie I realized it's a damper.
Believe you or not, people here calls mine kind of springs a "dual". Not to be amazed, as people here call every single four barrel carburetor a "quadrijet" and a two barrel a "bijet"...

Well, will borrow a vacuum tester, and do some readings as soon as possible.


Túlio Lazzaroni "FORD", Florianópolis SC Brasil.

'74 Ford Galaxie 500 292 V8

'82 Ford Galaxie Landau 302 V8

'98 Chevrolet S10 4.3 V6

'01 Ford Focus 1.8 Zetec

It is not a stock cam. I will not idle like a stock cam. A vibration could be an exhaust system thing.

Well gentlemen, I took a reading on the vacuum.
Took the car to the local Ford dealer, where the chief mechanic is a close friend and used their vacuometer.
The engine was at operation temperature, idling at 750 RPM and the reading was between 13,5  and 14 inches (the scale is not that precise between a full inch reading and the needle oscillates about a millimeter, what I think is normal).
I was kind of expecting that, since all spark plugs read really good, the points are new, there is no excessive blow by, no popping on the carburetor, and the engine pulls really well.
The vibration is more of the harmonic kind, as it comes and goes in regular intervals. I'm starting to think it's the exhaust...


Túlio Lazzaroni "FORD", Florianópolis SC Brasil.

'74 Ford Galaxie 500 292 V8

'82 Ford Galaxie Landau 302 V8

'98 Chevrolet S10 4.3 V6

'01 Ford Focus 1.8 Zetec

That's probably about right.  The E4 is pretty popular.  Maybe someone who has one can confirm.



Lawrenceville, GA

Well guys, I finally found the "source" of the problem.
Like I've told you guys, the engine mounts are new, so is the transmission mount. 
Well, since apparently the engine itself checked out, and the Isky E-4 really provides a something rouger idle than stock, I started looking at other sources of vibration. The exhaust on the car is relatively new, and it's dual, with a H pipe. From the factory the Galaxie had only one exhaust pipe, and there was the problem. On the right side of the car, the side still with the factory rubber mounts, one of them was so hard that almost felt like plastic. Replaced that one, and the one near the tail pipe exit and the vibration on the floor pans disappeared like magic. 
That made me worried about the 41 years old body mounts...
The car is not showing signs of having bad body mounts, and from the underside they do look good. Just as a precaution I started looking for a set of body mounts, and NOBODY reproduces those for a '66 Galaxie, that is what my '74 is. 
If someone would, they would have a huge market here in Brazil, as all our Galaxies are versions of the 1966 model. 

Túlio Lazzaroni "FORD", Florianópolis SC Brasil.

'74 Ford Galaxie 500 292 V8

'82 Ford Galaxie Landau 302 V8

'98 Chevrolet S10 4.3 V6

'01 Ford Focus 1.8 Zetec