Ozmodiar-X

I think this is the last thing i need to do with the rats nest, but i just dont know where it goes. Little help?

FirebirdSlayer666

iTrader: (3)

It looks like the vacuum control to the shutter valve, but I could(and probably am) wrong

Ozmodiar-X

do i block it off or what?

trochoid

iTrader: (6)

Remove the valve, take the carb off the intake and remove the butterfly and shaft, then drill and tap the hole in the intake left by the shaft and plug it. Drillsize is 11/32 and plug is 10X1.50 mm iirc. Removing the valve and butterfly yields better flow to the rear rotor. I use a dab of J-B Weld on the plug threads to insure sealing and that the plug/bolt will not move.

DublyDurty

That looks like the picture from Carl's tutorial on about page 16.

Trochoid's advice is probably the "proper" way to go but if you're just trying to follow the tutorial then go to page 24. Just above the picture of the blue air cleaner is one line of text that says: "Here's another wonderful bolt/hose combination. Cap both ports on the shutter valve".

DD

Kentetsu

Well, the problem is that the rear throat is slightly larger to make up for the space that the shutter valve takes up. Removing the valve will result in an imbalance between the front/rear rotors. A lot of people do it though and haven't reported any problems. This information I received from a very reliable source, so I don't really doubt it.

However, what I did as kind of a compromise, was to remove the plate on the shaft but leave the shaft itself in there. That way the flow would still be the same on both the front and rear. Is this a better way to do it? I have no idea. Either way will most likely give you good results so take your pick.

cdrad51

Being lazy as I am I simply removed the shaft and J-B welded the whole hole, without drilling or using a plug and it worked out perfectly.

immanuel__7

iTrader: (8)

i justed used vacume caps on them and i ended up not using vacume advance just take one advace timing vacume hose off and plug the other one in the one u just took off and voila i left my shutter valve on there just caped them and the car still dose over 100mph well noy any more seeing as im installing a 13BTII its now moving to fast now

82transam

iTrader: (18)

I did the same thing as you trochoid on both my 83's, put 10's of thousands of miles on the one like that and it always ran great. I still have the rest of the rats nest and it passes smog very easily, so obviously the shutter valve doesn't do much.