460 is running rich on Edelbrock 1411

[ArdWrknTrk]

I'm glad you've found this, or you would have been disappointed in the 650 AVS as well...  
I had a similar problem with my 1" Trans-dapt spacer that I used to eliminate the EGR on my truck.
The 0-80457S was okay but the AVS would stick.

If you want to be sure that your gasket clears you can set the carb on the basket and spray something in the bores* with the butterflies held open as much as you can.
This will leave a clear 'impression' and you just have to trim back to where there is no sign left visible.

You definitely want the bridge with a dual plane (stock) manifold.
That's kind of the point in having two separate smaller plenums.

*Damn phone!

[viven44]

Thanks Jim,

I thought about trimming the gasket but was worried I would leave ragged edges.... I guess it is worth a shot trying to trim. Not sure how to go about it. An X-acto knife ?

I have ordered the Edelbrock gasket as well. If that works well I'll stick to it...

[ArdWrknTrk]

I imagine you could get it done with a scalpel or X-acto knife.
It doesn't have to look pretty, as long as it seals and is out of the way.

I have tools like various sweeps of wood carving gouges, so I would probably chop it out like I was cutting holes in a gasket with a hole punch.

[Gary Lewis]

Yes, sure glad you found this!  

[viven44]

I am picking up the Edelbrock gasket. I'll use it as the template and give it a go!

[viven44]

 

Picked up the Edelbrock gasket today.


You can see that my old gasket is somewhat ruined as part of it peeled off and stuck to the EGR plate.

[ArdWrknTrk]

I'm going by the Post Office today, to send more of my dad's electronics to George.
I'll get that Edelbrock cover gasket off to you!  👍

[viven44]

Thanks Jim!!

I installed the Edelbrock gasket on the 460 EGR plate and it has this loud whistle only at idle (probably due to air flow in the gap under the carburetor as indicated by the blue arrows.) The whistle goes away when the throttle is applied.

I checked all around the base with a carb cleaner spray for leaks. No vacuum leaks of any kind but while doing that I realized that every time I hit the choke the vacuum reading dropped... I first thought there was a leak in the gasket around there but I had to spray at the choke for idle to change... I didn't understand that at first but realized later the hole under the choke is a large controlled vaccum leak.

[ArdWrknTrk]

Tracking # sent. Should be delivered tomorrow.  

Are you saying you heard no change when you sprayed below the choke?
Because if that is open to the outside it should have been noticable!

[viven44]

Excellent!! Thanks again

When I sprayed at the choke it vacuum levels dropped below 16 and there was stumble. That’s when I realized that hole was a vacuum leak

[ArdWrknTrk]

I don't think the gasket is causing your whistle, but if you want to make sure, you could always run a tall bead of silicone across and let it cure without compressing it all the way (kinda like China wall gaskets on an intake)

[Gary Lewis]

I'd bet the hole at the choke was the source of the whistle.

And to close that you could put a ball bearing in there - assuming there's a narrow spot farther in that will stop it from going through.  Or run a self-tapping screw in with some PST on the threads.

[viven44]

The whistle goes away even with the smallest application of throttle, like 1%… maybe that’s the vacuum leak at the butterfly’s… previously the butterfly’s were restricted by the gasket and I didn’t hear anything

[viven44]

I did limited reading on that hole. I’m understanding it is essential for choke functioning …. Will read some more

[ArdWrknTrk]

When I welded my muffler flanges I had some wire that got through the cracks and whistled like crazy under acceleration.

I thought it was a leaking gasket, but when I finally unbolted it and cleaned them up with a die grinder the sound went away...  

[Gary Lewis]

viven44 wrote

I did limited reading on that hole. I’m understanding it is essential for choke functioning …. Will read some more

I don't think so.  In the dim reaches of my mind I remember having to close that hole when converting to or from a manual choke.

And if the hole was needed it would be pulling filtered air, not dirty air.

I'll do some reading as well.  

[viven44]

I'm going to see if there is anything at all restricting the butterfly's but I'm actually worried I may have hurt the mechanism trying to open it while restricted all this while.... but I may also need to try to increase return spring tension, maybe that will help it close better.

Well, one way or another I should have an answer end of the week. The same gasket will go into Big Blue 2WD end of the week.

I still have a small delta in performance in stop and go traffic. The Bronco is missing the long lost cold air intake. Something like below should help right ? (Edit: Big Blue 2WD has the stock cold air intake in use).

https://www.ebay.com/itm/305701449426?_nkw=air+cleaner&epid=1461340269&itmmeta=01J6YF6AAJHE1DXDDQ7AC2XTFJ&hash=item472d39eed2:g:2A4AAOSwTJhmqT-8

[Gary Lewis]

Let me look up what the air inlet system looks like on that.  

[Gary Lewis]

Before the Bullnose era the Broncos were supposedly covered in the car MPC.  But I can't find what I'm looking for in there on your Bronco.  So here's the illustration for the pickups:

[viven44]

Thanks a lot!!!! That is really useful to confirm part numbers and see where the screws go.