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Didn't read the whole thing but more than I needed to. I will just say that I installed a O2 wideband logger with a vacuum gauge in my 67 notch in a custom gauge cluster above the console. I was an early adopter of the AVS2 and having the wideband allowed me to tune my engine to the car. I wont...

Yes there is a separator between the two.

Below is a link to a thread I started when tuning my AVS2 for my motor. There may be a few nuggets you can glean from this. Step up spring clarification? AVS2

I consider my wideband as important as oil pressure or a mechanical temperature gauge. It is indispensable for tuning carburation.

You need good vacuum readings to know which way to go with the springs. Your combo speaks to the need for softer springs.

To help you vacuum at hot idle would be helpful. You will need a spring kit for your carburetor and some jets too.

I think moparmatt2000 did that change. I wish I had done it when it was convenient.

Damn autocorrect

Not that I am aware of. It's the Edelbrock part numbered gasket recommend by them. I'm running an aluminum 1\2" spacer with gasket on the LD4B then the insulating gasket then the carburetor.

I have the AVS2 500 cfm on my 273. Installed on the recommend insulating gasket and after a small tuning change the tune is most excellent. Solid from idle to WOT.

I have a 500 AVS2 on my 273 +.040. I had to go down one size on the primaries and a spring change to get mine into the mid\high 14's. I run my PR at 4.5.

The book calls for five psi. What cfm carburetor for the 360?

Those numbers look about right to me. Your cam will give you those vacuum numbers at 14 advance and the AFR is about right. I don't think there is a direct correlation between vacuum and AFR readings. There will be a direct connection between timing and vacuum though. JMHO, as it is similar to...

For what you are doing an AVS2 would be the perfect carburetor. You would want the 650 or 800 for the size of your engine. Don't waste your time buying used, just buy a new one. Don't forget to buy the insulating gasket that goes between the carburetor and the intake to prevent vapor lock and...

That model has not been out long so the odds are in your favor. I would ask the seller why he is selling it, if it had problems ect. You can download the tuning chart from the Edelbrock website and parts are plentiful. I know they have a 500, a 650 and I think they just came out with an 800...

Thanks for that. Having run both I can say me and my Barracuda really like our 500 CFM AVS2 on the 273. My car has never run so well. It did take some new rods, springs and jets but only because if my wideband. When I got it, it was undeniable!

Sounds like fuel to me. Unhook the fuel line on the carburetor side of the fuel pump and turn it over. Unhook the coil wire first. Pump the fuel into a container and dump what you pump into your lawnmower. This should confirm or not your fuel situation.

I know what the plugs are supposed to look like. I can't determine tuning changes other than richer or leaner and there is so much more. Read the plugs to determine which way you need to go but don't change jets yet. If you are rich go one size larger rod and lean go one size smaller rod. Use...

Yes I learned to get the baseline timing and idle settings as close as I could. Then study the wideband and seat dyno making small changes. Every change effects the others so understanding what the carburetor is trying to do allows one to select the next component change. With a little patience...

Try running the next stronger spring. The larger jets changed your vacuum profile.

Not to my knowledge, different animal. However knowing what I do now I would tune it exactly the same way I did my AVS2.

I have reached satisfaction with my Edelbrock 500 CFM AVS2 on my 273 Commando (type) build. The biggest help achieving this for me was figuring out how everything worked together. (this is for the guys new to tuning these carburetors. You experts forgive me as I know you all already know this...

I am running a Lunati hydraulic version of the stock 273 Commando cam with a little more lift and duration, not much though. The pink spring is not the strongest but should be the one for 14" of vacuum at idle. I will do down one spring this week but I want to get some road miles on this setting...

I changed from a Holley I fought for 2 years. There is no doubt in my mind that this AVS2 is the superior carburetor. After yesterdays changes my car ran the best it has since I put it together. I agree with the previous post though, Edelbrock beat the tuning knowledge to market with the...

Update on my AVS2 tuning marathon. I downloaded an AVS2 tuning chart from the Edelbrock website. Studying it I decided to lean out with one size smaller jets and the rods recommended to go with the jets. Went from 095 jets to 092 and the new rods are 67 X 45 or something like that. The Edelbrock...

good luck!

Where is the pcv valve plumbed for the vacuum source. The 390 4V carburetor does not have a proper port. I dumped mine after over a year of trying and tuning and installed an eddy Avs 2 now the car runs.

So the verdict is in. The stock rods that were in my AVS2 from the vendor were 70 X 52 and the change recommended by Edelbrock was to change to 73 X 52 which I did. I left the springs that came with the carburetor and my wideband shows 14.6 at idle and 13.5-14 at light cruise which was my...

I changed the rods and springs. I should have only changed the rods, putting stock springs back in in the morning. I redid my valve cover gaskets as I had a weep and tested the car. It idles at 14.6+- and cruises at 14,2/3 jumping around a bit. It is running 5 degrees hotter than is was so it's...

I just got my valvetrain sorted and checked my vacuum. I have 12" hot in park and 10" in drive. Will probably change the rods first without a spring change and go from there.