Need help with PCV hook up on my 409 340hp Impala, for a Edelbrock AVS2.

[64 SS 409]

I have a 64 Impala with the original carburetor and intake, it’s the 409 with 340hp. I’m going to install a Edelbrock AVS2 carburetor on my original intake manifold, I do have the adapter from Show Cars to adapt new carburetor to original intake. need help with the PCV hook up. Has anyone done this and how did you hook up PCV .

Thanks.

 

[La Hot Rods]

How is the PCV hooded up now?

 

[64 SS 409]

The original set up is like this, with the pcv hose hooked up at back of original carb which has a small hole that acts like a pcv valve. My new carburetor will not have this set up, if my original valve covers had holes like newer ones have for pcv hook ups, I would be fine

 

[64 SS 409]

Here’s my original set up

 

[Don Jacks]

If that elbow at the back has the orfice in it adapt it to the back of the AVS2 in the back of that carb.

 

[La Hot Rods]

Get a PCV that will screw into the back of your carburetor.

 

[64 SS 409]

Perfect guys. I’m getting the new carburetor next week, and I will see if I can screw in a pcv valve or the elbow that I already have in my original carburetor. I’m pretty sure this answered my questions.
Thank you guys.

 

[64 SS 409]

I just checked out the AVS2 and it looks like I can get the vacuum for the pcv from the front of the carburetor or the back of carburetor, the back has threads.
thanks again.

 

[DonSSDD]

The setup I recall with that closed oil fill tube was that nipple on the tube was connected to the bottom of the air cleaner. The connection on the back of the intake went to a pcv which was connected to the back of the carb.

 

[blkss64]

The factory closed positive ventilation system used a calibrated orifice to control the flow of the crankcase vapors, as Don said. Nothing new here. My concern is that if a conventional pcv valve were used in place of the orifice, the increased draw of the pcv valve will pull too much and eventually oil will be drawn into the vent system. I might be wrong but the orifice is only (.120) in diameter. Not a lot compared to a pcv valve such as the Delco CV590C.

 

[64 SS 409]

Good point Jon, I will see if I can screw in the 90 degree fitting which has the orifice, the one I have marked in green, in to the back of the new AVS2 carburetor, then all I have to do is tie in the rear draft tube in to a new air cleaner, the one marked in red. So fresh Clean air will be sucked from air cleaner in to the back of motor, then pulled to front of motor through oil fill tube back to bottom of carburetor to be reburned. This way it should be pretty close to the factory set up.
thanks

 

[blkss64]

Show Cars makes original style air cleaner bases for the larger series AFB carbs. Don’t know if they have one for your engine or not. Might be worth a look.

 

[Fuzz1957]

Not all PCV valves are the same.

Fuzz

MAGA

 

[64 SS 409]

I just ordered the carburetor base only, from Bruce over at Show Cars, so I should be able to use my original air cleaner top. And it will look so much better with the original air cleaner on it.
Once I get it all together and check hood clearance, I will post a picture and include hood clearance dementions, because I had to use the carburetor adapter from Show Cars and I got a Edelbrock heat insulator which is about 5/16“to 3/8 “ thick. I’m using my original intake manifold.
(This website is so helpful)

 

[64ss409]

I put a quadrajet on mine and used all of the original closed positive crankcase ventilation plumbing.

 

[64 SS 409]

I got the new Edelbrock AVS2 carburetor installed, it fit great on my factory intake with the carburetor adapter I got from Show Cars, I also used a heat insulator. It raised the carburetor about 3/4” to 1” over all. So I have 1 3/4” clearance to the hood at closest spot. I still need to install my AC compressor, but I think it will look pretty stock under hood, and that’s what I was hoping for. Thanks for all the help with this, it saved me time and money.

 

[blkblk63ss]

So how does it run now????

 

[64 SS 409]

It runs very good now, I still need to fine tune the carburetor and timing and get it out on the freeway, but I can tell it’s so much better then my original carburetor that has some issues, with my original carburetor it would not run very well. I had the original carburetor rebuilt and so did the guy I got the car from, so it was gone though at least 2 times.