Edelbrock carb question

I have a Edelbrock carb# 1406 on my 73 Olds 455 w/ Hei distributor. Looking at the carb, should the vacuum advance hook up on the left or right side? It's been on the left since I've had the car and it runs fine, but I've been told it should be on the right. I appreciate any help the HAMB can give, thanks


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One port supplies full manifold vacuum at idle, one does not. The one that does not supply vacuum at idle rapidly starts applying vacuum as soon as the throttle blades are open.

In my experience, engines with a long duration camshafts can have unstable idle timing when using the the port that supplies full manifold vacuum, since at low engine speeds the vacuum may drop far enough for the vacuum canister on the distributor to start taking away advance.

Again, in my experience, almost all "stockish" cam setups idle better using the full manifold vacuum port.

Edit: Please note that both ports stop supplying vacuum when you go to full throttle.

 

It honestly runs better hooked up to the port on the left (looking at the carb) the car will never see full throttle or be raced at all, it's just a cruiser


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Dont want to Hijack your thread, but does your whistle at part throttle?
Ive got a 455 withthe same carb and when the first ****erfly is fully open, but the secondary isnt, it kinda whistles.

Thanks

 

http://www.edelbrock.com/automotive_new/misc/tech_center/install/carb_faq.shtml

Q: Which side of the carburetor do I put my dist vacuum line to?

A: Generally the distributor vacuum line goes to the timed (p*** side of carburetor) port. This is mandatory on emission controlled applications.

Q: My carburetor whistles, what causes this, how can I fix it?

A: This may be caused by a rip or tear in a base gasket, air horn gasket, or adapter gasket or some foreign material stuck in an air p***age of the carburetor. Inspect the gaskets to make sure you have no vacuum leaks of any kind. Check to make sure carburetor is seated correctly, and is fastened with the correct hardware. You can perform a quick check to find external vacuum leaks (such as a leaky carb base gasket) by spraying starting fluid on suspected areas while the engine is idling. If the engine speed changes for a second or two after you spray an area of the carb, you’ve found the leak.

You can also download the manual.

 

I've never really noticed any whistling at all


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Thanks yall, its not really a whistle I guess, its kinda border line air noise. But only right before the secondary ****erfly opens, not loud, just one of those things that you hear every once in a while...

 

I always run mine on full vacuum.

 

Me too. ported side will have no vac advance at idle and that will make the engine have higher temps when idling cause it;s not as efficient. If you do a lot of stop and go driving this could be an issue. If you are highway driving all the time it;s not a problem.

You can gennerally get a smoother idle with the vac advance on full manifold vac, too. Left side port.

 

jason, fyi... you can go to UTUBE, querry on Edelbrock, and find various videos on how to setup/tune your Edelbrock 1406.

 

Thanks guys


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