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Thanks for the info. Though blend the holes in the casting, wouldnt that produce lots of metal shavings? It sounds like it should be done on a bench with a good cleaning afterwards.

The box yes.

Jan 2023. Hard to know which one makes the sound, though my FF box had no hissing noise.

I have the hissing noise too, had it from day one. Cooler installed.

I did drive stock for many years, then changed a lot of suspension/steering parts + a modern alignment. Now my charger is more fun to drive than all modern Normal/sport-cars I have tried. (Havent tried the new Challenger though.)

Then it is a no-brainer. Slap on the 650 AVS2 with a Eddy 9266 gasket for heat protection. A very forgiving combo for the old engine. :thumbsup:

To the OP. Dont stare blindly at the cfm. Choose size in where you live in Rpm when you drive. Especially size of the primary venturi. Check my thread, those tests were done on a 413: My Carburetor journey.

The repop of the Thermoquad is the Holley Street Demon 625/750. Awesome carbs. The 650 AVS2 has smaller primaries than the 800 and will give you a snappier response down low. (If you want that with that gearing?)

That Red lever returns your idle to normal when the choke has been heated up, it does so by falling down. There is another small metal lever coming from inside the choke house that keeps that red lever from falling down until choke is heated up. So, check the spring etc inside the choke house...

Nice going. I am also about to do this on my Indy intake...though what would be a smart way to check that the intake gets centered over the holes in the cylinder head? I guess marking the valley pan is one way.

Check out My Carburetor Journey thread. I went on tinkering til I found max top and bottom in the same carb. My Carburetor journey. Here if you want to test something really fun, it is the spreadbore way you should try out. :thumbsup: For ex an 850 Thermoquad with those really small triple...

Where should it be placed?

Any advice here as I also have the hissing sound transmitting up through the steering column? (I am not in the US.)

What hose and oil do you use? Did you use any extra shims in the pump? Im running a saginaw pump. And yes, the sound is louder at idle and almost goes away when actively turning.

No, it is as Bradfly posted. The noise is from the borgeson box and it is transmitting up through the steering column.

Yep, same situation with me.

Cool that you got it sorted. ....got me thinking, did the old spacer cover those idle passages on the bottom of the carb correctly?

Depending on engine but mostly it gives a cleaner signal from the carb, try it. :thumbsup:

4429 have that extra air-screw in the middle, right?

Leds are such a nice upgrade. I know some people doesn't like it cos it is not original etc... But I can put on every light in the car including the headlights and the Amp meter does not move....how is that for saving that electrical system. :thumbsup: