I had a brainstorm about a torquey intake when I saw some single barrel carbs for sale. Is there any good options for mounting a couple of those YFA carters onto a 390? I'm planning on the motor living in the idle to 3500 rpm range. I have a stock 2barrel intake on now and will prolly end up with a 2100 on there.

It just seemed fun to wonder ...

 

A YFA carb isn't a good choice on a FE. The requirement of idle to 3500 rom isn't really good either. At that range you are not in the powerband, what cam are you going to use? I could see idle to 4500 rpm or 1500rpm- 6500rpm but not the requirement you have mentioned.

 

Yes I saw the Edelbrock performer claiming idle to 5500. But realistically I wasn't planning on using anything over 4000. I'm looking for torque. My newer diesel pickups spoiled me. I wanted to stay in the two barrel low rpm torque range. I saw those carter YFA's and thought it'd be really cool to start with one of those and when floored the secondary would open up. So WOT would be 2 single carbs.

It's a pickup, not really the place for one of those 8 pack setups. Well maybe, but I can't afford that right now. And the motor wouldn't be ready for it.

 

We had a 390 2v in the '66 wagon. Pretty sure that was done by 4500, may never have gone over 4100.

For what you are doing, the stock 2bbl manifold and the Autolite 2bbl is about as good as it's going to get. Simple, reliable, safe.

You can get the tiniest one off a Falcon or some other mini-mobile with a 260 or 289. At the top of this forum it explains CFM and code/venture size cast into the carb. Get a .98 for it, you'll have your 3500 rpm limit.

https://www.ford-trucks.com/forums/1...eral-info.html

 

I guess I'm rather looking for low rpm torque. Rather than finding some handmade single barrel intake. Are the .98 throated 2100s going to be best for that?
If I do use the Edel performer 4v intake, would I get better tq numbers from a edelbrock 1403 500cfm with a heavy spring delaying the secondaries? Or an adapter plate allowing an autolite 2100?

 

What you want is the cylinders filled as full as possible at low rpms. So you need a balance between venturi size and intake velocity. Too small on the carb, you add pumping losses and don't allow enough air/fuel into the motor. Too large, lower velocity at low engine speeds, and thus the cylinders aren't filled.

You get a nice amount of torque here because of the size of the engine. Up to a point, the smaller carb will still give you that, but power will drop off earlier. Properly tuned, the other combinations will also result in low rpm torque, and allow more power at higher revs.

Serving suggestion: Use the 2bbl manifold and find a .98 to 1.08 carb and run it. If you like it, bingo. If not, try something else. Unless you have a dyno under controlled conditions, you aren't really going to be able to pin it down.

Again, don't try to reinvent the wheel. The stock 2bbl manifold and Autolite carbs fit, are safe if properly assembled and installed, and are reliable.

Read through this. Short version, the larger the motor, the more torque.

https://www.hotrod.com/articles/hrdp...sepower-guide/

It's all about filling the cylinders. That's why a lot of turbo motors make and hold their peak torque at 1500 rpm, or some other fairly low number compared to NA motors.

 

thanks, I'll do some more reading.

 

I'm still learning about the 390 I had my 69 F250 running for only a few months now after rebuilt everything , it has the stock 2bbl intake on it the previous owner had a 4412 Holly with a 1" spacer it was completely stock at rebuild i added a comp 265/275 dual energy Cam that's as big as I could go with stock heads according to the rebuild shop .
Just installed Patriot H 8046 headers I replaced the older version of the 4412 with the newer one 2017 it's a monster burns the tires , a little off topic but I never had a 2100 or a motorcraft don't know how it would compare to the 4412 I also have a 350Holly 7448 I wanted to try I know it's not a hot Rod but can't help letting her rip ....

 

When I looked up numbers, it seemed you might've meant 8406 headers. But that seems like a slick set.

 

H8406 ....H8406-1 are ceramic coated well worth it my engine bay is way cooler than those cast iron logs yeah there pretty sick for the money I'm Happy with them ..