19stang66

Yes you are correct in saying that my engine ran like sh*t. But that is also due to the fact that the rubber fuel line was kinked before the fuel pump

So what's the difference between using the bottom nipple for "full manifold vacuum" or the upper nipple for "ported manifold vacuum"??

my68ride

The vacuum line from your automatic transmission would go there

2+2GT

Well, It could go there, but the factory connection for the trans was the rear manifold fitting. That carb fitting is very convenient for connecting the manifold vacuum part of the Distributor Vacuum Control circuit, but again, since the 4160 was not a factory installation, Ford connected it elsewhere.

For example, the "red stripe" hose could be connected to that port-

barnett468

This is a complicated and sometimes contentious issue, lol.

The bottom front fitting is full time manifold vacuum. Do NOT use it for your distributor or trans.

The top side fitting has supposed to have virtually 0, nada, zilch vacuum at idle. I has vacuum just a hair above idle.

If it has vacuum at idle you have a problem. Tell us and we can tell you how to easily fix it.

Gun Jam

Whats ****ing complicated is why my68ride would reply to a 6 year old thread...yeah its great you want to help this guy but im not sure how this even happend....

-Gun

barnett468

Ahhh, ha, ha. That's funny. I didn't see that.

my68ride

I answered a 6 year old thread??? I was looking for a Holley carb. part and I guess that question popped up. Stupid computers! I changed my 289 for a 302 with aftermarket intake manifold and Carb, so that is where I had to connect my trans vacuum......didn't know it was a 6 year old thread and don't even know how I ended up on Mustang Forms.

Gun Jam

For whats its worth there is somewhat of debate between running a vac advance dizzy off of full manifold vac OR ported vac.

distributor manufactures will always tell you to run ported vac.

However there is a following of individuals that have good success running full manifold vac on there distributors.

I have tried both and I found that running full manifold vac caused the exhaust to smell rich and unburned despite allowing me to run idle mix a full air fuel ratio point higher than I could with ported vac. Im thinking this is due to reduced exhaust gas temps in the headers not fully burning off the exhaust.

-Gun

barnett468

you might know this.

the ported and manifold vac are exactly the same above around 1/8th throttle opening.

there is basically no ignition advance from the vacuum under hard acceleration.

the sole purpose of dist vac is to improve mileage.

in california you must have the original smog equipment in place even if your car passes the tailpipe test.

on the old cars they check the emissions at idle and cruise but only use one reading.

calif smog is stupid, lol.