Upper Plenum ?'s
- Thread starter doorgunner26808
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New Member
doorgunner26808 said:
i believe the 99+ have a slightly larger inside diameter. i read this a while back but i have not measured to be sure.
Miles
Founding Member
The PCV valve connection into the upper intake on the front is a little different too btwn pree 99's and post 99's... so if you get a new upper intake, make sure it has both options (my accufab came with both)
02dragGT
New Member
the only real difference is the vacuum lines. I Port these things for people and have seen a a few different casting styles inside. some of the 96-97 styles have tiny vacuum/pcv lines and are a horrible design, most of them have a hump in the back, i've had a couple that didn't. but basicly they are the same.
lover
Founding Member
I'm kind of just getting into the Mod motor. A 5.0 man you know. But I bought a ported plenum with a 70mmTB. I don't know what year Ford changed the size of the valve, I'm guessing it's the PCV, but his was a lot smaller than mine 
. I have an 02GT. I''m glad I had only taken a few bolts loose before I actually installed it and noticed it. Maybe someone with a more extensive 4.6 background can tell you what year the change occured. 
. I have an 02GT. I''m glad I had only taken a few bolts loose before I actually installed it and noticed it. Maybe someone with a more extensive 4.6 background can tell you what year the change occured. 
BooWFO
New Member
You can use it just take a a smaller vaccum line put over the port on the plenum and inside the other vac line. That's what I did been working fine.
comatose
Member
Per Modular Depot's plenum comparison test they stated: "In 2001 Ford changed the size of the PCV fitting on the plenums to a larger size."
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