New/Repro YF carburetor for the 300 six

Excellent!  Glad it is working out, all the way around. 👍

Ford F834 wrote

I am guessing that months of driving around with a failing carb may have carboned things up, which is getting cleared out, or the carb itself is smoothing after some use. The high rpm range seems like it might be slightly weak, but overall I’ve never had this truck run this smooth. It’s great. I might bump the timing back up just a bit, as it’s not kicking back or pinging in the slightest. I might get away with a bit more advance. I am very happy with it, though, and so glad I didn’t just return it and write it off as junk! It’s not... my straight six has never sounded so good. 🙂

Maybe the higher RPM "weakness" is indicating a less than optimum timing situation at that speed?

It might also be a bit lean.

FYI:  
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F201907292294

Ford F834 wrote

Two of the three supplied gaskets were of the closer (old style) stud spacing. If you want a grommeted gasket for the wider studs, you will need to source it as the supplied one is paper only:

Two gaskets for $4.90 delivered?  Wow!

Great find, Jim!

David, you are the master of this game!   👑

But while I am wasting time skimming through thousands of listings I try to remain conscious of others.

I recall Jonathan posting that his carb didn't come with the anti-crush gasket in the wider spacing.
And I noted that an '84 part number was almost definitely for his application

There are some crazy deals at U-techcenter this week!

Thank you very much Jim! The pair of gaskets are on their way 🙂. I re-used the old one, and it’s running fine, but I’m not going to pass up a deal like this. I will use a new one when I change to the non-EGR spacer. I would have put the spacer on with this last carb change, but it is thinner and requires shorter studs. I have them, but was more interested in getting it running than making all of the adjustments for the choke cable brackets etc., so I let it go for another time.

So happy that your truck is running well, Jonathan!

Jonathan,

What's the news 2 months later??...all systems still check OK?

I need to order a 300 carb soon, and I've been saving yours in My Ebay for just that day, but I recently noticed that it says "Does Not Ship to Canada". Bugger.

Anyway...
A guy on FB linked to a carb he bought on Amazon (see below) and he said it works great. He said he bolts it on and the engine started right up and only needed a couple light adjustments.

https://www.amazon.ca/dp/B084YWG1K2?ref=ppx_pop_mob_ap_share&fbclid=IwAR3PVQfAp5UkMnpTQtSPyxSa7DtnN3nNXl-eSQ6wwGObF743MneRwj0c9M8

I wonder if the Amazon one is the same or similar? Any comments good or bad from the 300i6 crowd?

Do you have a recommendation for carb gaskets/kits?

Ok, so I bought another YF copy from Amazon, and I suppose I should have asked before I ordered, but what is supposed to connect to the little brass fitting on the choke? Can I just leave this open? I will likely be installing a manual cable anyway...

I'm pretty sure that's where hot air from the exhaust manifold goes in.  And while the carb should be tuned to accommodate that amount of vacuum, you don't want to be pulling "dirty" air in.  So it either needs to be plugged or routed to a source of clean air.

So originally there were exhaust gasses plumbed to this port via a tube from the manifold? I suppose I could rig something up, as the original line is long gone now.

No.  There was clean air coming from the air cleaner down a tube that was heated by the exhaust system and then went into the choke.

Gary Lewis wrote

No.  There was clean air coming from the air cleaner down a tube that was heated by the exhaust system and then went into the choke.

Ahh ok very good sir.

I connected this "unused" port, since going with manual choke, to the port high up on the throttle body, which originally supplied filtered air to the tube which ran through the exhaust manifold and supplied heated air to the choke housing. It was neat and could not be seen while using the original air cleaner.

1986F150Six wrote

I connected this "unused" port, since going with manual choke, to the port high up on the throttle body, which originally supplied filtered air to the tube which ran through the exhaust manifold and supplied heated air to the choke housing. It was neat and could not be seen while using the original air cleaner.

Thanks David, I will do the same thing then as I plan to install a manual choke.

Can you recommend a manual choke kit that works well with this carb or should I just order whatever generic kit I can find easily?

Rembrant wrote

1986F150Six wrote

I connected this "unused" port, since going with manual choke, to the port high up on the throttle body, which originally supplied filtered air to the tube which ran through the exhaust manifold and supplied heated air to the choke housing. It was neat and could not be seen while using the original air cleaner.

Thanks David, I will do the same thing then as I plan to install a manual choke.

Can you recommend a manual choke kit that works well with this carb or should I just order whatever generic kit I can find easily?

This is the one I used, Cory:

https://shop.advanceautoparts.com/p/dorman-help-choke-conversion-kit-55101/5013275-P

Hi Cory,

My updated review on the unit I bought is still positive, but speaking of the choke I will say that my manual set up is perhaps even more touchy and hair trigger than on the OEM carbs. It’s been chilly enough to need some choke to start it, and it’s never really smooth. It’s kind of a balancing act of pedal and choke for the first minute or so until it warms up enough to actually drive it. I don’t know if it’s just me or if it’s a carb design defect. To me it’s not a huge deal, since it runs well once it warms up. Unfortunately I don’t know what brand my manual choke it is. It came with the truck.

Thanks for the feedback Jonathan. I just received my Chinese YF copy carb from Amazon yesterday. Seems like a nice enough piece to look at, and the packaging was very good. Came with 3 gaskets that I haven't even looked at yet.

I ordered the Dorman manual choke from RockAuto (for $9 bucks) with some other stuff last night.

I'm probably a month or more away from trying to start it, but I put a bit of a push on ordering parts last week and this week since deliveries leading up to Christmas will be crazier this year compared to others.