Last time I drove my 54 it had a little miss. Usually I would not worry about thinking points or a bad plug wire. Well it was on the way to a car show I made it their and back fine but mom was behide dad and me and she said when I stomped down on the gas the Black smoke pored out the back. I thought maybe gas too to I added some treatment. I Plan on new points and wires. ( maybe one of the elec ing upgrades one of these days) But I have a feeling that I maybe looking at more than just a tune up probelm since I have the smoke. Two years ago we put a 4bbl on and adjusted the valves 292. It did not have the black smoke then. I drove it some and then parked it with some starting during the winter. This summer the water pump went out and so the truck set most of the summer with out a water pump. (still looking) So I put the pump back on for the car show and to drive the truck a little bit. The intake was hot taked, sand blasted, and painted(dont think it is the problem) The Carb is a rebuilt ford 4300 carb. I dont have the numbers off it or what it is off of as it came of ebay. ( in a rebuilt box) The choke is not hooked up as the cable is not long enough( will be fixed soon) But the choke is open. So is what I am facing a tune up probelm or do I need a smaller carb/ differrnt carb.
Thanks
Also does anyone know of a good source for plug wires? I have looked at all the local auto parts stores and no luck on them fiting. Also my wire lumes(orginal) are there but not attached, can some one remind me where they attach?? thanks

 

Sounds like you may be overcarburated. The black smoke is usually a sign of running rich. You may be able to dial it in a bit better with a carb kit and needles to lean it out some, but I'm not familiar with that carb. At any rate, it doesn't sound like a big deal to fix.

I'm sure others will be along to help with specifics.

 

Black smoke would indicate a rich condition. If you pull the spark plugs I'll bet they are black in color and covered in soot. How bad is the miss? is it a hard miss all the time or just misses a bit under load?

The best way to get plug wires to fit exaclty how you like them is to buy a set of the ones that you cut to fit. Even when I've bought factory wires from a dealer they didn't fit like the factory wires from the assembly line..

Bobby

 

I'd bet on a vacuum leak that is causing the power valve to open up.

 

I dont think i can get much in the way of jets for the carb. It is a ford/ autolight 4300. It is not like the 4100. It is not leaking that i know of. I put new vac lines on it when we swaped. I think the only one is to the dist. I dont have power brakes or anything. Any sujestions on wires? I have never made a set nor know anything about it. any brands better than others? Anything to watch out for? any special tools?? I have a feeling it is too much carb. Any sujustions?? ( thinking of the 525 demon with manual choke or the 390 holley or 500 holley) If I have to replace it. For some reason i think i ran the numbers when it was listed and it was for a 427 ford. maybe 68. The miss is not really under load or constant. It seem like a plug wire. Also if I go to a different home made plug wire do i need a different wire lume?? Any sujustions there? Also what about the elect ing up grade, any info on that?? 54 292 with stock wiring except converted to 12 volt. I know pidrodex makes one does anyone else? Like Mallery? thanks

 

If I read your question correctly, the same carb and manifold worked fine before you took the intake and carb off? Sandblasting (not bead blasting?) may have made the manifold surfaces uneven enough to be leaking, or perhaps you torqued it down unevenly. If the Y-blocks are like the FE series, they are difficult to seal anyway. Take a vacuum reading at idle, see what it is.

 

I'm real familiar with the carb your running (4300 Ford). That specific carb was designed by GM for Ford and was a common carb used on big blocks like the 390 and 460 from 1968 and up engines, which came in various Ford and Mercury vehicles. These carbs rarely worked good and either leaked or ran poorly. These carbs are very difficult to change jets on or rebuild because when you pull the top off, springs and ball bearings will come out. Basically a real pile of junk carb. Some die hard Ford people insist on using them for their originality. I recall my dad had these carbs on his 68 Cougar with a 302 and his 69 Cougar with a 390. Both carb ran extremely rich to the point were it left black soot stains on the driveway when he started the engine not to mention black spark plugs. Most people remove them and sell them on ebay. (Sorry) My suggestion would be to get an aftermarket carb like a Holley or Edelbrock. I'd bet it would fix your problem quick and you'll see a day and night difference in performance.

 

No I was changing from a 2bbl to a 4bbl when I switched. The intake sat for awhile before I got it. that is why i had it blasted and hot tanked. The problem has happend a year after puting the intake and carb on. Sorry that I did not make that clearer.

 

Hmm, from what imlowr2 stated it would appear that you have too much carb for your set up. For a stock 292 I would guess that you need something in the 500 to 600 CFM range. One of the biggest mistake people make is to overcarb and engine (yup, I had to learn the hard way on this one too)

Here's a couple of links that might be helpful on choosing a carb;
http://www.edelbrock.com/automotive/math.html
http://www.summitracing.com/streetan...harts_carb.htm

Good luck
Bobby