PCV question

[OldRedFord]

I have a Holley 3310 that I am going to use on my 460. There are three vacuum ports. In the instructions it says to hook the PCV hose to the PCV port, but which is it?

476985853_1670609178_0.jpeg

[fordman]

the last picture.

[ToughOldFord]

None of those, they are all way too small. PCV uses a 3/8" hose IIRC.

Edit: Now that I look closer it may be that first one if it is actually larger than it looks in the picture. It is in the correct location and the power brake booster gets it vacuum off the manifold, not the carb.

Fordman, that last pic isn't very good, but it looks like a 1/4 or 5/16 fitting to me.

[fordman]

i couldnt even see the size of the bottom port. i just said that because that is the normal place for it to go.

[george worley]

I have a 3310 on my 390 and the pvc port is the one on rear of the base plate. The one on the front of the base plate is also full vacuum but on my 3310 it is a smaller port opening. I use the front one for full vacuum to the auto trans. shift diaphram. I have had mine hooked up this way for years and no problems. Also I use the front port when I use my vacuum guage. The port on the metering block goes to the vac. advance on the dist.

[eggman918]

I have a 3310 on my 390 and the pvc port is the one on rear of the base plate. The one on the front of the base plate is also full vacuum but on my 3310 it is a smaller port opening. I use the front one for full vacuum to the auto trans. shift diaphram. I have had mine hooked up this way for years and no problems. Also I use the front port when I use my vacuum guage. The port on the metering block goes to the vac. advance on the dist.

mine is set the same way and is running properly

[BobbyFord]

The first pic was the PCV port.