Desmogging a '78 200 carb

[aribert]

When I put the '78 200 into my '61 Falcon, all of the ERG/smog stuff is somewhat redundant. I'll be using headers so that end of the EGR will not exist. How do people block off the port on the carb spacer? Also, I presume that I can remove the vacuum module sticking out of the carb spacer. I have machining capabilities - am I better off just making a carb adapter? What about the electric solinoid on the back (car position) side of the carb - this engine was mated to a slush box and I am using a manual trans. I am in quite a rush to get this car up and running again (my winter/utility/daily driver just swallowed a valve) and tonight I'll pull the head on the other c ar to decide which car can be made to be running again quicker.

Another thought is to make a custom spacer and mount the Holley 1904 from my '61 on this engine as a temp measure to get it running. Yea I know that the engine will be under carb'ed. But, using the 1904 will allow me to use the existing carb linkage without any modifycations - again a time saver. Long term (this winter) I intend to mount a Weber 32/36. I have cores of both DGVs and Holley/Webers - is either one of them to be preferred?

 

[mustang6]

You can remove the EGR valve and block it off with a custom plate. Sounds like you will have to fab something no matter which way you go- if you use the new carb you've got to deal with a cable linkage hookup, if you adapt your old carb you will have to make a carb spacer to adapt it to the head. In my experience there is usually enough meat in the carb ears to slot them and bolt the carb straight down to the larger OEM spacer.

 

[CZLN6]

Howdy Aribert:

Your 1904 will not be compatible with your '78 DuraSpark II distributor. The 1904 will have a Spark Control Valve that sends a modified vacuum signal to the OEM Load-O-Matic '61 distriburtor. It would work, but not well.

Your best bet will be to deal with the '78 Holley 1946. I hope you got the air cleaner with the '78 engine. You will also benefit from a cable linkage set-up from the foot feed to the carb.

Adios, David

 

[aribert]

Thanks for the replys. I intend to keep a point distributor for now so (I think that my major carb compatibility issue will be an undersized carb if I go with the 1904 - right? I am assuming that the A/F ratio should still be reasonable. The old 200 is coming out on Saturday and I plan on leaving the '78 carb in place until the new engine is in and running - then I can decide which carbv I want to mess with. I did get the '78 air cleaner.

 

[notdone]

The vacuum line from the distributor goes to a 3 barbed fitting on the heater hose attachment at the water pump, Could someone explain that. I had my 1946 carb rebuilt. Not using any smog stuff. I cut the extra stuff off the EGR plate and filled the EGR hole with JB weld and now it looks pretty good as a spacer. I'll run the PCV hose to the EGR adapter, Do I run a hose from the distributor to the carb or do I have to use the three barb that was used before the smog stuff was taken off? Hope this makes sense. Thanks, Bill

 

[Patrick66]

sounds like that might be for the choke.

if you plug the SCV you can use the holley 1904, just use manifold vacuum like you would with a non-SCV carb.

 

[notdone]

I forgot to tell you that the engine is a 79 200 that was in a fairmont. I've had a few oops latley, mind goes a lot faster than my typing. Manual choke. The carb shop told me to run a hose from the dizzy to the carb port that he left. On the 79 it ( the vaccuum hose from the dizzy) went to a three prong plastic adapter on the heater hose near the water pump. Do I plug that three prong and use the carb for vacuum?

 

[fordconvert]

The three prong thing is likely what the call a ported vacuum switch that switches the distributor between ported and manifold vac depending on coolant temp. I have had good luck using manifold vac for the dizzy on all my cars including the stang. I believe it starts on manifold which gives you a higher idle and worse emissions. Thats why the factory then switched to ported vac so you didnt have any advance at idle which = better emissions.

 

[notdone]

So I can plug the nipple on the carb and go to the manifold? Thanks again, Maybe I'll see you at a local show sometime. Bill

 

[JackFish]

Are you sure the carb is a 1904?
I ask only because that was not standard on a '78 motor, so I wondered if it came with the motor, or was something you already had?
Are you running a DS2? If so it should be connected to the spark port on the carb.