440-6 vacuum advance line

[Steve340]

I suggest trying the vacuum advance on manifold vacuum first. You can always repair the metering block later.
A tube knocked in with some epoxy will work fine.
I have found that with the modern fuels especially if the transmission is an automatic the engine responds well to more timing at idle.
This is in my opinion is essentially the main difference between the two ways of getting vacuum to the canister.
Sometimes you need to limit the old vacuum cans because they had 20 - 30 degrees of advance depending on what fuel the engine was designed to run on.

 

[Kuro]

Hey guys. It's been a while but since the weather got a bit better and I wanted to keep you updated, here we go.

I adjusted the carb with the help of a specialist, put the vacuum advance to the manifold vacuum and installed a wideband gauge to monitor everything.

As of now, it starts great cold and warm, runs great, sounds good and Afr seems fine for a carb engine. Can't say anything about fuel consumption just yet, will update when I gathered more data on that. Have some other small issues to figure out but for now I'm pretty happy

 

[Steve340]

With the extra timing you will probably notice the fuel consumption will improve.
A stock or an engine without super high compression ratio can be run quite lean and with a fair bit of advance at light engine loads.
Fuel mileage improves and the spark plugs get hot enough to self clean.

 

[Katfish]

Thx for the update, time to put some miles on it and enjoy.