what's safe to remove?
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Freshman User
Joined: Nov 2003
Posts: 25
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From: Frankfort, KY
what's safe to remove?
Can anyone tell me what exactly I need to leave hooked up on my vacuum lines? I have a '78 F-150 with a 351M and C6 and it's non-catylst.
I have a huge mangle of lines on the pass. side rear of the engine and I'd like to "simplify" if you know what I mean.
I know the tranny needs vacuum but is it manifold or carb?
I just found out I've been driving it for 6 mo. with the advance hooked to manifold vacuum.
I don't know what to do with the rest since it runs from the mangle to the temp switch in the water outlet and from there to the big coffee can by the battery.
Any info on figuring this out would be greatly appreciated!!
I have a huge mangle of lines on the pass. side rear of the engine and I'd like to "simplify" if you know what I mean.
I know the tranny needs vacuum but is it manifold or carb?
I just found out I've been driving it for 6 mo. with the advance hooked to manifold vacuum.
I don't know what to do with the rest since it runs from the mangle to the temp switch in the water outlet and from there to the big coffee can by the battery.
Any info on figuring this out would be greatly appreciated!!
Posting Guru
Joined: Feb 2002
Posts: 2,404
Likes: 3
From: Cleveland, WI USA
I just did this to my 79 with the same engine, but I have a manual tranny so I don't kow which lines go to the c6. You'll want a hose to the vac. adv. from a ported vac. I don't know which carb you have so I can't tell you which port is the right one. If you have a vac. guage, test the ports and find one that has zero vac. at idle and use that.
You'll also want to keep the hoses from the heat well to the choke unless you put in a manual choke like I did.
For the most part, I took of everything but the vac. advance. If you can wait until Monday, I can take some pix of mine and send 'em to you.
Kevin K.
You'll also want to keep the hoses from the heat well to the choke unless you put in a manual choke like I did.
For the most part, I took of everything but the vac. advance. If you can wait until Monday, I can take some pix of mine and send 'em to you.
Kevin K.
Posting Guru
Joined: Feb 2004
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From: Saratoga, NY
ported vacuum is above the throttle plates, just find a port toward the top of the carb and hook your dist. to it. Below the plates is manifold vacuum and is what everything else will use. If your not sure you can always hook a vac gauge to them.
High vac on idle (18-22)= Manifold, raising the RPM will make it drop.
Ported is just the opposite
High vac on idle (18-22)= Manifold, raising the RPM will make it drop.
Ported is just the opposite
Thread Starter
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Freshman User
Joined: Nov 2003
Posts: 25
Likes: 0
From: Frankfort, KY
Thanks guys, that's what I thought. Now the hard part is getting my big butt back there to undo most of it. I hooked the advance to a port underneath the choke, it had no vac at idle and it increased with rpm, she runs a lot better now especially at idle.
