V8 cam, intake and carb swap +Random pics of 8600/1406/3731 going in...almost there!

[shaolinsifu]

great thread,awesome pics, now I have a great idea of what I am about to undertake myself!! I have the 1406 4bbl,stock 4v intake from'65 Marlin, elelbrock cam, collection of gaskets and hoses, looking for a dbl roller timing set...(not currently available from edelbrock..??) checking with Jegs...we'll see... gettin excited!! now more so!! Thanks!!

[shiner2001]

Here is the bracket that I made to relocate the throttle cable so that it will line up with the Edelbrock's linkages. I got the dimensions from Edlebrock. They sell part #EDL-8034, but I didn't want to spend $16 for a piece of aluminum that you can make yourself very easily. I used a cut off wheel to notch the factory bracket to fit around the bolt that secured the new piece to the manifold. On the Edelbrock one, they have a tapered head bolt that is countersunk into the adaptor, but it was just as easy to do this.

Temporarily installed before it was in the Jeep:


Bolted in after the manifold was installed:


Nevermind the heater hose in that picture, it's just a piece laying there, not connected to anything.

After hooking up the throttle cable to the carb, it seems like it may not return to 0 throttle under it's own power, so I'm going to have to look into that some more tomorrow. Anyone have any ideas on that?

[james1414d]

I would like to sugest to you that locktight is what you should use on all the threads , service removable blue on the top stuff & pan /covers , permanent red on rod & main bolts. exhaust manifold bolts gets antisleze. locktight also prevents rust & corission

WTF? Ignore this post please.

[shiner2001]

New Pictures and Questions about Vacuum...

I thought today would be the day that I got fire to the ol' girl, but alas, not so much. Stupidly I cracked the aluminum (freshly painted, no less) thermostat housing installing the vacuum fitting to the back of it. So, as far as that goes, waiting on a replacement, hopefully I can track one down on Sunday. The one on the Cherokee has a horizontal pipe fitting out of the back side of it, but I need on with a diagonal facing one so that there will be room for the fitting. But I digress.

So, in my quest for the definitive 8600/1406/3731 thread, here are a couple of questions that are probably super simple, but seem to be escaping me, possibly because it's 4 am and I had a couple beers after calling it quits on the project tonight.

First of all, in the picture below, what goes to A, B and C? A and B are threaded fittings on the manifold, C is the threaded fitting on the 1406 (plugged in the picture, but I'm thinking that something else goes there).



Next...in this picture, the front of the 1406, are the two small nipples (D and E) next to the fuel/air mixture screws. One is listed as "for emissions controlled vehicles" and the other for "non emissions controlled vehicles." This is an 84 and had all the smog stuff (air tubes, pump, etc.), but I have removed all of that. The question is, what vacuum line goes to which one of these nipples, if indeed one does go to either one. (They are both capped in this picture).



OK, now hopefully back on track with something I have done right that a picture of will help someone else and not just me while pointing out my own ignorance. This is a picture of the throttle cable assempbly on the 1406, with the included transmission kick down adapter installed and the throttle cable and transmission kickdown lever attached. I had planned on using the Lokar kickdown, but it seems that I was able to adjust the factory one out far enough for it to work. Not 100% sure of that yet, but it seems to fit. I suppose I do actually have a question on this one...is the kickdown suppose to move at any amount of throttle or is there supposed to be some throttle movement before it is engaged. The way it is made seems to be so that it has some room (approximately 2-3 inches) of travel, so I guess I'm not sure if this is hooked up appropriately or not. This picture is at "rest" or zero throttle, so you can see that any throttle applied will "pull" on the transmission kickdown, is that correct? By the way, the blue cable ties in the picture are on there so I can tighten them up and hold the throttle at about 2000 rpm when I do the break in, they are not a permanent feature, ha.




By the way, I labeled all the "questions" with a letter so that anyone that can lend an answer can easily refer to the picture in their answer.

Thanks!

[Ristow]

A will be a small vacuum fitting going to the vacuum ball. B goes to the EGR,or you can use C off the carb.

D is ported vacuum, E is manifold. i highly suggest you take the time to tune the distributor for manifold vacuum,it'll run much crisper.


the kickdown generally has about 1/4 throttle worth of slack. adjust it to be pulled fully forward at full throttle and you're done.

[shiner2001]

D is ported vacuum, E is manifold. i highly suggest you take the time to tune the distributor for manifold vacuum,it'll run much crisper.

Can you elaborate a bit on ported and manifold vacuum, and especially on how to tune the distributor for manifold vac? I am running the stock distributor until I get everything back to good working order, then swapping in a Mallory HEI. I was trying to eliminate variables for possible problems by making less changes at one time. Based on that, does that change anything about tuning the distributor?

[shiner2001]

From looking more at my old manifold set up and in the manual, it looks like A goes to the 5 way vacuum fitting that is attached to the same fitting that the rear heater hose is (visible in the bottom of the ABC picture). Nothing was disconnected from the ball on teh firewall directly behind the manifold...I'm so confused.

[shaolinsifu]

I understand "c" to be vacuum port for brake booster according to edelbrock install instructions on their website...kit comes with a plug and a fitting depending on use,if yours was not a kit (like mine) I picked up a fitting at Advance for about 2bucks...

[shiner2001]

I understand "c" to be vacuum port for brake booster according to edelbrock install instructions on their website...kit comes with a plug and a fitting depending on use,if yours was not a kit (like mine) I picked up a fitting at Advance for about 2bucks...

So does F go to C? (F from this picture and C from the first one) It's been months since I pulled this apart and I didn't label some stuff when I did. Where was F hooked up on the stock set up?

[shaolinsifu]

from what I gather in the instructions at edelbrock's website, yes "f" goes to "c" . sounds like you'll need to remove the plug thats there and install a fitting from the parts store that goes 1/4"npt to 3/8 tube ...pull up edelbrock.com and follow links to the carb page then you can bring up a pdf of the instruction manual including a parts list of what origionally came with the carb when it was new...and also where all those ports go to...I'll be installing a 1406 pretty soon on mine so I've been doing some homework to make sure I am familliar with what goes where when the time comes...

[shiner2001]

I have all of the literature that came with the carb (I bought it new), I've just been kind of slow on the uptake with all the vacuum mess, especially since I am ditching all the AIR tubes and pump and what not. I'm gone from home until next week, so it's just sitting in the garage wondering where I went right now. I seriously almost changed my schedule this week just to be able to stay home and work on it. Ooohhh, the sickness...

[grand_wag_85]

Cool pix? What's that funky looking gear thing on the end of the cam? Fuel pump lobe?

[shiner2001]

Cool pix? What's that funky looking gear thing on the end of the cam? Fuel pump lobe?

The fuel pump lobe is actually right behind that gear. Hard to tell in that picture since its from straight on.

[grand_wag_85]

The fuel pump lobe is actually right behind that gear. Hard to tell in that picture since its from straight on.

Gotcha...So it's the Dizzy gear

[shiner2001]

Gotcha...So it's the Dizzy gear

Right-o