Installation Of Round Tops In A 73 240

[alordzot]

HELP PLEASE. I purchased a set of round tops and the intake manifold to replace the flat tops on a 1973 240. Disassembly and removal is not an issue. However replacement is where I am getting stumped. All of the pluming that was on the old carbs, along with the smog stuff is getting me confused. Is there a source that has a step by step or at least some hints as to what I should so with all the connections that I no longer will have when I install the new manifold and carbs. Is this really more complicated then I first thought. I have the knowledge to tare the motor down and rebuild it but I have never dealt with carbs and carb systems.

Zippy

[alordzot]

engine compartment

[Bambikiller240]

Can't help you with a step by step, but the pic of your new carbs/manifold is missing the smog equipment that it came with from the factory.

I think I would just block off (plug up) anything that I didn't have a place to connect on the new manifold.

One other thing, I doubt that you will be able to use the carb operating linkage that is currently on your car when using the new manifold. Lenght of the linkage is different between Flat-tops and Round tops.

I'll try to get a pic of a Round Top set-up with all the "normal" equipment attached later to day for you.

[Ed]

Start by removing all that smog stuff that is attached to the 73 intake manifolds (most of it probably doesn't work anyway). Now you will hear that the 73 manifolds are better than the previous years but this is not proven and up to you. You won't need the air pump either (this is the pump on the drivers side of the engine and it has a hose that runs up to the exhaust manifold) but that is up to you if you leave the original exhaust manifold with the backfire valve attached. Or you can plug the gallery to prevent exhaust from coming out.

When you attach the new manifold the only attachments you really need is the vacume for the brake booster and the vacume for your vacume advance.

The rest of the carb attachments are pretty easy. Float bowl vents to the air intake box. Valve cover vents to the center of the air intake box. PCV valve to the block.

Plug the water that runs through the manifolds. If you plan on using the water passages then make sure the freeze plugs under the manifolds don't leak. Also the tube that connects the two manifolds.

Like Bambikiller said make sure you have the correct throttle links or you will be stuck. The 73 links will not work.

Good luck.

[Bambikiller240]

Depending on your states emissions requirements for older cars, you may "need" the smog pump. So before you toss this stuff out in the garbage you might want to confirm what the requirements are in VA

BTW, many people say to toss all the smog stuff out because it probably doesn't work anyway, (NOT pik'n on you Ed, heard it many times in many places) well I just finished a complete rebuild of my 72 L24 enigne and have bee messing with the smog equipment. I replaced the vacuum hoses only and after blitzkraig tuned my carbs another friend offered to put the car through a smog systems check ( for free and not reported to the state) and the car passed with flying colors.

[alordzot]

Thanks all, I still could use all your comments, keep them comming.

[xbox]

I'm at a loss for words,I did this swap myself and it is easy once you rip everything off the motor so you can see what the hell your doing wish I could tell you how to do it

[alordzot]

Ok if the stock linkage is not going to fit where can I get one that will. Does Ztherapy sell them?

[Ed]

Have you tried to get the linkage from where you got the carbs?

[alordzot]

Carbs were purchased on ebay. so No access to them.

[xbox]

if you look at the firewall linkage theres about an inch or so extra rod I wonder if the flange can be ground off and rewelded so it will work?

[Ed]

Try posting in the wanted section maybe someone has one laying around.