So I just bought this carb, verified it's a 4160 vacuum (4451-1). So my question is, obviously its not electric choke, but I've never seen a manual look like this. So is it a manual choke? Also, there is no rear (intake side) vacuum port for the booster. I see the timing advance vacuum port, but not one for the booster. Is that what the port (but it's threaded) is underneath the choke assembly? BTW it's going on a edelbrock performer 2101 manifold, non computer car, and th350.

What do you mean by "booster"?

Vacuum from the brake booster.

Could it possibly be an old hot air choke?

Vacuum for the brake booster goes to the big port on the back of the carb. Problem is, you still need something for the PCV valve.

Looks like some sort of automatic choke to manual choke conversion kit. The choke thermostat has been replaced with a cable attachment. May have been a hot air choke.

But there is no port on the back for the brake booster vacuum. Which is why I am confused.

OK so I could use the port on the back of the manifold for the brake booster?

Currently my carb has the pcv port capped.

There looks to be another vacuum port on the upper section of the carb that comes from above the secondaries chamber. It has a small section that is broken off, but the valve in it is still intact. Refer to pic.

Which one would be pcv and which one would be timing?

I'll have to admit I don't know what that broken off looking piece is.

You can hook the vacuum booster up to the manifold port. PVC would be a large fitting. There isn't any large vacuum nipple on the base of the carb, either front or back?

Are you sure about the LIST number? It doesn't show up on Holley's website. Might have been an OEM carb for something, though. Any clue to its history?

No, there isn't a large vacuum nipple anywhere on the carb.

I have no clue of the history, just bought it with the intake, and thought I'd rebuild it and run it. The previous owner only used it for mock up.

It has list # 4452-1 and under that 3386. When I was browsing through Holley spec sheets on their website, it lists the 4452-1 as a 4160. But I've never seen one without the rear vacuum nipple. So I'm confused. Could it possibly have been a marine carb?

Might be a reason for that.

Ah. Your original post said 4451.

Goggling 4452-1 produces several hits indicating it's a Ford carb.

Damn, so the probability on being able to run it are pretty slim then I guess? Would it be worth rebuilding it and trying to run it, or should I just go pick up a q-jet and rebuild that?

You could probably rebuild it and run it. We've already identified some weirdnesses. Hard to say how it would run.

Q-jet would be pretty safe. Assuming one will bolt onto your intake manifold.

Well seeing as how it will be complicated trying to route/run the vacuum from the dist., pcv, and transmission, I think I'll just find something that will work easily on a gm engine. No loss though, got the carb free with the intake (which is a sbc intake). Maybe I'll throw the carb on ebay for a ford guy.

Thanks for all the help Five7

Looks like a a school bus carb. Ford used a spacer plate with the nipple on it. I would replace that choke cap with another(electric).You can swap out the base plate with another carb. like a 3310.

So if I changed the baseplate, I could use one that has a provision for the brake booster, etc?

Don't bother. You might make a couple of bucks off of it selling it on eBay, but there's really no reason that I see for trying to use it.

I agree, might be a waste of time for unsure results.

I bought several 3310 Holley's off ebay and made two real good carbs out of three.

but I obviously don't have as much carb knowledge as you do, so I think it would be best for me to just get something I can run without modification.

Get you a good Carb. to run and use as a base line. Gather up some old carbs and tinker with them. Thats a good way to learn. Buy a book, I recomend this one (Holley Carbs 4150 / 4160 Series (BK-HP473)by Mike Urich) to start. It is a small easy book to start with then step up to other books or the information on this web page is great.I baught my copy at Super Shops, lol that's dating myself.