Hello,

I am searching for the vacuum line diagram for a 1962 Bonneville 389 4bbl.

Thanks in advance

Uh...I don't think such a thing exists. Your 62 should be pretty simple. PCV to manifold, carb to trans & dizzy vacuum can to manifold or carb. What's the issue?

Thank you! I will give it a shot. Why are these lines blocked off?

I think the big vacuum hose is for your pcv next to the dizzy  , 3 goes to 6 on my motor, but check that the same rear vacuum port is feeding vacuum to your dizzy and transmission too 👍

Edited May 12, 20242 yr by 64 kiwi boni

Is that a vacume booster for the brakes?

Thanks for youuur reply. The two lines  coming out of the arb are blocked off. I'm trying to figure ou why.

i recon that number one is the pcv valve hose, there is a pvc down the back of the intake vally by the dizzy. the small pipe off that rear tee is the line to that number 2 port, which isnt needed, but i see no vacuum line to your dizzy or going off down the back of the motor to the trans mission ! is your trans auto ? 

that top picture you can certainly see the vacuum line to the brake booster going over the rocker cover 

Thank you for your input. Appreciate it

That little steel canister on the end of the carby is the dashpot - I got rid of mine. You WILL need vacuum advance from the dizzy and the trans vacuum line too. You will also need to hook up the PCV to the plate that sits under the carb - where the outlets are pointing toward the front.

Thank you!!!! I will let you know how it goes. Thanks again!

If you want to see how vacuum hoses and electrical wires are routed, I would suggest investing in a reproduction shop manual for your car. While there are not many hoses in a '62 Bonneville, as compared to a 2004 Bonneville, it is still worth the investment to have all the exploded views for your entire car.

Detroit Iron sells both electronic and paper copies of the factory manuals.

https://www.detroitironis.com/1962-pontiac-chassis-shop-manual-print.html

I have the shop manual. Nowhere does it gointo vacuum hoses

Does/Did the car have Air Conditioning...??

If so the vacuum brake/plunger (#2/#6) is used to automatically adjust the idle speed to compensate for the extra drag on the engine when the AC compressor was turned on..The hex on the carburetor end is for the proper sized wrench to adjust the vacuum brake/diaphram in or out (lengthen/shorten)..In order to Adjust the idle speed to the correct RPMs when the AC compressor is running...I'm unsure of where the vacuum source to operate the brake originates from...Although I Suspect that there is an electrical/Vacuum control switch under the dash/on or near the heater box related to the vacuum  supply that controls the doors in the heating/AC system to direct the airflow to the proper vents/outlets...If you don't have or not going to use the AC you can just eliminate it....

TLBT...

Edited May 13, 20242 yr by TWO LANE BLACK TOP

Thank you! Will let you know soon. there are other pressing issues first.

On 5/13/2024 at 11:13 AM, Jimvlv said:

I have the shop manual. Nowhere does it gointo vacuum hoses

True - however, if you pay attention to the exploded pictures, you will see the engine, transmission, or under dash showing attached vacuum hoses in those diagrams. I've never seen a formal vacuum diagram - for any car.

Thanks to everyone who replied. I found the port and hooked that to the vacuum on the distrib.

Hmm - do I hear the sound of a can of worms being opened? Many moons ago Kiwi posted a tremendous post on the different types of porting. If he sees this, perhaps he'd be kind enough to repost it. The type of porting makes a difference.

Thanks

Here is a post from my own musings:

I am not sure that’s the right vacuum port Jim 

on the base at the back of the Carter is the correct vacuum for your distributor 

Thanks, I will switch them and see what happens