Carburator Mercury 255 Flathead
 

I'm going to replace my Teapot carb with something new. What would be a good suggestion? What was the original carb that came with it from the factory?

Re: Carburator Mercury 255 Flathead
 

I am using small base Rochester 2G carburetors on a couple of my engines. I am very happy with them. If you mount them backwards on the manifold, the throttle linkage and fuel line just about fall into place. The choke is completely backwards from what it needs to be for manual operation, but the Mercury manifolds have provisions for automatic chokes that also just about fall into place. One of my engines has an aluminum Canadian Mercury manifold and a 2GV (divorced choke carburetor). All I had to do was bend the linkage arm a little to make it line up. The second has a 2GC (choke on the carburetor,) and all I had to do to get that one working is to shorten the Mercury choke stove tube.

The small base Rochester's bolt right up to a Mercury manifold, but the throttle bores are larger. I used a 1 7/16" Rota-broach to bore the manifold out on both of mine and there seemed to be plenty of "meat" in the manifold so nothing broke through. The only downside I can see to this is that the distributor has to be changed as the Rochester does not have a port that supplies the proper venturi vacuum signal required by the stock Load-a-Matic distributor. You can go with either an old Mallory dual point (which I like) or you can have a later SBC distributor converted and recurved by any one of several people on this board; "charlieny" and "Bubba" come to mind.

Re: Carburator Mercury 255 Flathead
 

It depends what year your 255 Mercury is. '49 thru '51 used the Holley model 885FF which is basicly a teapot two barrel with the cover on it for a side inlet air cleaner.


The '52 and '53 255 Mercury used a two barrel teapot model 1901 that used a conventional top mount air cleaner.


If it were mine, I would fix the original carb (if bad). Swapping to another brand from another engine just starts a chain reaction of changing parts, like the distributor, since the vacuum signal will be incorrect for the advance, air cleaner change, throttle linkage fabrication, fuel line hook up, ect…
I can help you with the original carb if it needs repair.


Sal

Re: Carburator Mercury 255 Flathead
 

I'm keeping the "teapot" Holley that was original on my 52 Merc. Its not perfect but I've gotten used to it's idiosyncrasies and have adjusted my driving style to live with it..

Re: Carburator Mercury 255 Flathead
 

I am running a Holley 390 cfm 4 barrel carb on my otherwise stock '53 Merc in the '34 pickup. Starts easy, runs great, decent mileage. Price is about $500.

Re: Carburator Mercury 255 Flathead
 

what all did you need to do to make linkage work with the 4 bbl.? what dist. are you using? Mark

Re: Carburator Mercury 255 Flathead
 

Now that you mention the Holley 390 CFM unit, here are some numbers to think about : a Holley 94 flows about 140 CFM, while a small base Rochester flows around 280 CFM. You have to be careful comparing 2 BBL vs 4 BBL flow numbers because they are rated differently. The 94 and Rochester are both 2 BBLs, so I think you can do some meaningful comparisons.

I have a 255 '51 Merc with Edmunds heads, a Mallory dual point, and a small base 2GV in my '51 Ford club coupe. It starts easily, runs well, gets decent gas mileage (19 mpg on a 250 mile road trip at 65 on the interstate), and performs excellently overall. Since I use this car as my daily driver during the summer, I really appreciate not having to fool around with a dual carb setup. (It doesn't look nearly as impressive, though.)

The hardest part of installing one is preparing the manifold (although the carb does just bolt on). I'll agree with Sal about rebuilding the original if you are into stock restorations, but for a flathead powered DD, you will find a 2G hard to beat.

Re: Carburator Mercury 255 Flathead
 

The '34 has a spoon type gas pedal with cable linkage to the left side of the carb. Speedway has the parts.

Re: Carburator Mercury 255 Flathead
 

You may want to send Sal your teapot and have him rebuild it. I did and my 52 Merc runs like new.
Rob

Re: Carburator Mercury 255 Flathead
 

I use the 2GC and a Cheyv converted dist on my 280 flathead, The block is stock but bored To save an old hot rod engine .145" using Egge 3 ring pistons, EAB cam and heads. Can't believe the amt of torque the engine has. The Holley 2110 used on the 54/55 trucks will work with the load a matic dist and should preform well. I have no idea how much these carbs flow, but they have a throttle bore similar to the 2GC.

Re: Carburator Mercury 255 Flathead
 

Charlie in ny rebuilt my Holley 885FF, 49 to 51 Merc carb and the car never ran better. I just put it on the other day. I love it. old guy.

Re: Carburator Mercury 255 Flathead
 

Sal, wondering what you charge for the rebuild? And where do I send it?

Re: Carburator Mercury 255 Flathead
 

I'm not sure what happened. I answered your PM yesterday.


I just resent a PM to you to answer your questions. Also included my phone number and email address. Email might be easier than Ford Barn PM's


Thanks, Sal


Sal

Re: Carburator Mercury 255 Flathead
 

Tubman, I read one of your posts about a plate you made to mount under a 2GC, on a Merc manifold. Do you still have them? Thanks, Bill Nelson

Re: Carburator Mercury 255 Flathead
 

Yep. You can have one for shipping rounded to the next dollar. I'll figure out the best way to send it and post it here. It may take a while as I am leaving town for 3 days tomorrow.

Re: Carburator Mercury 255 Flathead
 

Great! I just picked up a 2












Great. I just picked up a 2G today, other than choke difference, what is dif between 2g and 2g??

Re: Carburator Mercury 255 Flathead
 

2G - Manual choke
2GC - Conventional choke (choke mechanism on carburetor)
2GV - Divorced choke (choke mechanism on manifold)

I can post pictures when I get back in town at the end of the week if needed.

Re: Carburator Mercury 255 Flathead
 

Here is the picture of the plate I use to make sure there are no vacuum leaks on the base of a 2G when used on a Merc manifold.

Re: Carburator Mercury 255 Flathead
 

@scicala

Sal, I'm looking for a rebuild kit for my Holley 885 on my '50 Merc.

I'm based in the UK so unfortunately cannot send away to someone for a rebuild.

Mike's Carburetor Parts lists two different rebuild kits for the 885, either a straight 885 (P/N K7128) or 885FFG (P/N K7127).

I've looked all over my carb and cannot find a P/N to match up to his look-up list.

Are you able to help me identify which one if the correct kit for my carb?

Thanks!

Re: Carburator Mercury 255 Flathead
 

Matt,

'49 thru '51 Mercury's used the 885FF carbs and I haven't seen one that was stamped with the Holley number.
The correct kit for your '50 Merc at Mikes Carburetor is K7128.
The K7127 is for heavy trucks with manual choke and usually a governor.

Hope this helps you, Sal Cicala