Look what I found now..A D66 Dual Quad Intake for a SB

[Chryco Psycho]

the hole between the carbs could be as simple as a small drain hole to allow fuel or water to drain out & not be trapped in the well btween the carbs
 unless you are talking about the port through the intake for the heat crossover which I woudl definatly be blocking off

[dodge freak 2]

No it is tap but its a blind hole. Can't seem to post pictures right now, says up loader is full.

I have the Carter dual carb linkage, made in 1987, brand new as well. E-bay has been good to me.

I'm using Fel Pro 1213S-3 it has a steel core, I just drill a small hole for the exhaust heat. Ran the RPM intake all summer like that, was fine. Need to find and old style heat spacer for the carbs but I found some intake heat is good up here in Michigan, have no fuel vapor problems either, even with that Carter this week..maybe our Gasoline is different here. It be cool in a month and cold in two months.

 
Seems everything today isn't made as good at  Edelbrock too, wasn't so in to paying top dollar for a maybe.

[dodge freak 2]

Have it 90% done but these pictures are before then.

Those holes in the middle, well they be perfect for some return springs for the back carb...that might be what they are for.

[dodge freak 2]

UPS came by a little after 6pm     You know its always around by 2pm expect when its coming for you, lol.

So could not adjust it but got motor running. So far so great. Idles nice, its hook up 1 to 1 cause I did not have a small enough bolt to hook it up progressive style--the back carb working first. Both carbs open together.

Part throttle its as good-if not better than before-super cool, might  need  a bit larger accelerator pump shot but most times was ok. I believe its jetted too rich cause it has .094 jets in the secondaries and edle calls for .086 for their 600 carbs in dual quad mod. Really they say .077 for 500 carbs but the secondaries are the same size for both carbs. 

I see, opened it up once in 2nd and yeah its down on power  so jet change it is. With the one 500 carb even .003 made a  difference you could feel. So I have some jet changes to take care of .

Carb isn't as shinny, not sure if it polish up, I didn't hit the road until 7pm, stinks...but the intake sealed up good, 

Oh my MPG seems like before, lol....have to hook them
progressive style...check out my spring return bracket..not pretty but free and it works..that hole in the middle turn out not to be tap, now I notice, not sure if there is room for a tap now.

[brads70]

Being a mold maker building die cast molds , my best guess about the space/hole/cavity between the carbs is nothing more than a cavity for saving aluminum and weight during the casting process. Pretty normal practice for cast parts.
Brad

[dodge freak 2]

Being a mold maker building die cast molds , my best guess about the space/hole/cavity between the carbs is nothing more than a cavity for saving aluminum and weight during the casting process. Pretty normal practice for cast parts.
Brad

You mean the space in between the carbs on top, yeah I agree it how it was cast.

Follow the black pointer, that little hole its pointing too, that is what I'm guessing could be a return post for the return springs. Its either that or for some type of linkage they had in the 1960's.

I already changed the back spring around. Spray white lube on areas that move. Found 4 .083 jets but only 2 .086 jets. I need some air filters too, so maybe I order them. Brought two carter strip kits but of course stuff is missing.

Can't cry too much, got very nice stuff, most new and total cost just about $800. But took me 6 months-really longer to find this all on E-bay.

[brads70]

Ah now I get what you mean! Is it tapped for a thread?

[dodge freak 2]

NO...both sides have them and both are not tap.

So maybe its a pivot point for some type of linkage. Or maybe it should have been tap??

I swap those ..083 jets in back and went for a night drive. Its cool already here, 65 degrees like. Opened it up once in 1st rev quick and nice to 6200 rpms before I let up. Everybody was driving so wimpy...seen not one cop either, after an half hour with no action at all, I went home.

Its getting there...might be there but could not say for sure. So happy that sealed good and runs nice...

Anybody want a Race 650 Demon (has removable boosters) cost $750 new from Jegs,  its on E-bay for a few more days...$225 plus shipping....Ebay is dead this month, few buyers..might be going in storage til spring...best time to sell hot rod parts.

[brads70]

I think it's a tooling hole for when there were machined from castings at the factory.
Carb sounds like a good deal for someone? I could use something bigger. ( 440)
Brad

[dodge freak 2]

It RUNS, runs good.

Tried .083, .077 and then could tell it was lean (wasn't missing but part throttle pulled hard but not much change as it went to WOT so it has .080 in and seems pretty darn good.

Low end is better, its still 1 to 1 but going to try progressive when I get to it. (would just leave it but MPG isn't so great but then my 1/4 throttle power will be weak.

Going to call Edelbrock and see about getting different weight air doors for the secondaries--at least 2 stock ones to play around with. Seems in first with my 3.91 gears and 2.74 first gear it flies open fast but who knows, maybe it could become even better than with that Demon carb.

It starts nice, idles nice..its 65 degress out here today and carbs are cool to the touch shutting down and intake is very warm but doesn't burn your fingers.

I tried a cold intake before, up here it isn't as good. All the fuel doesn't burn it seems, the exhaust stinks of unburn fuel no matter the jetting with a cold intake and under 70 degress outside. I'm using a MSD 7al box and HVC coil to fire racing A/C spark plugs--not store rapid fire but from a NASCAR seller on Ebay..they had hot enough plugs for street use.

EBAY, if you can take your time and get lucky its a gold mine of old stuff, some brand new..both carbs were brand new, one made in 1998, the other 1999. Got the last ones before Edelbrock took over. No vacuum ports or choke linkage, very clean looking.  Using Carter linkage too, nice and simple one rod, not two like Edelbrock has.

For you big block guys, Edelbrock still makes a dual plane intake, put two 600 or even 750 carbs and enjoy better low rpms, I was a Holley-Demon lover but not going to miss them anymore. 

[dodge freak 2]

You know what, its better already. Better low and even mid range power, hard to say after 5000 rpms but has to be as good as before. Two 600's would take care of that but...I believe the primary boosters are all that are different, maybe Edelbrock sells those new as well but think I'm leaving it as is for this year.

Beats buying a new car, lol. I have a different ride, in the same car. Now all I need is $2,000 for a Turbo Action Competition Transmission and 10 inch TC, might go with a 11 inch thou. Thats next year..tranny shop by house said $500 he can rebuild the clutches and reuse the TC but I don't trust them in a way...might get it all apart and then say $1,000...and not be as good for what I can get for $1,300.

Well that is 6 months away cause I'm broke, lol.

[71chally416]

You should look into the rollerized Dynamic tranny along with their 9 1/2" custom made vert. Frank will match the vert to your combo and the rollers bearings will reduce your parasitic losses.  You can really feel the difference when you turn the Input shaft. 

[moper]

On the track, the fully rollarized transmissions are good for about .2 off an ET around mid 12s. About .3 on something closer to 11.50s. For the price, it's not a worthy mod for 90% of the cars being used as street/strip deals.

[dodge freak 2]

What if you are in need of a trans?

But i want a trans with a manual valve body so it needs no kickdown cable-rod. Nice too is how you can take off in any gear. If caught in the rain 2nd gear take offs are nice.

[moper]

Price a rollerized one... then ask if you need THAT one...lol.