Good afternoon to all my fellow Cadillac owners! I have a question about the vacuum advance on my car. The car is a 64 without a/c and a Rochester carburetor. I noticed that I have vacuum at the port when cold idling but not when hot and idling. Is this normal? The car seems to run fine, but I thought I should have constant vacuum.

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When you say cold idling is the choke engaged and pushing up the rpm? If so then you would have some vaccum with the throttle is parially opened from the choke. .. at least that is what i remember when I had the stock carb setup with choke.

When I first start the car before the choke fully opens there is vacuum, but after the choke opens I have no vacuum at idle. The car drives great but it seemed strange to me.

rpm?  off choke it should be idling at about 480 rpm, and since these are ported no vacuum. On Choke on I believe is 1700 rpm. With AC on and Idle speed up engaged about 900 rpm.  As the accelerator is engaged the ported vacuum system will introduce vacuum. It has been a very long time since I have had a stock carb. Perhaps someone with a stock carb can provide some vacuum spec at 480 rpm idle, 900 rpm AC on, Choke off, 1700 rpm Choke full on.

Thank you as always Jason, I figured it should have been normal, I recently found out the car had a modified Chevrolet carburetor on it and I switched to the proper Rochester. I am idling at around 480 engine warm. The car is running so much better than it did. 

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