Oddly enough, just this "Quadrajet copy"...the 4360.

I got one of these carbs several years ago because I saw it had the spreadbore pattern and mechanical secondaries. The Holley number is a 4360, and mine is a 9694. My Holley book has a good section on this carb and the tables of data show all about it. It is a single pumper and surprisingly heavy, weightwise. A long time ago I asked on this forum about the carb, and Slant Six Dan, among others clued me in to its name as the Economaster. It has a lot of unneeded hose tubes but they are readily blocked off. IF you are familiar with a 8007 or a 4150 you will know just what you are looking at, and my Holley book is complete with photos. IT was made in 1978 - 1980 for 215's and 260 size engines, small V8's and sixes. I got this one off a Buick. Initially I was told it was made for California and had to be on a special intake manifold. But as Slant SIx Dan said at the time, the carb doesn't know what it is sitting on! How true. I picked up a Mr. Gasket spreadbore adapter for my Offy manifold and was about to pop it on, but came across an Eddy 500 I didn't have to rebuild. so never rebuilt the 4360 to try out. It still intrigues me though! Frank Raso is a great 4jet resource BTW.

rock
'64d100

One last question before the thread closes.........
How many people that have the 390 actually open up the secondary butterflys? I know CJ is using a 600, and reports good results. That carb flows 300 cfm on just the primarys......do you think that the larger bore would kill the vaccum signal? (CJ's is working good, but he may be more strip oriented than me....right CJ?) I'll be driving this thing everyday.
That 600 looks good........I may go with it unless someone here just says: "NO, Bad Idea!" In that case I'll go with a 500 Edelbrock.
Thanks ahead, and thanks everyone for helping me narrow this down!

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225 Cubic Inches of Iron-Head American Muscle

225 bored .040 /.100 off block, Schneider Cam 224@.050~ .480 lift - Stock valves, blended bowls, Offenhauser intake with 500 Edelbrock carb

Mine does (and to the point that at WOT I still drag 5-7" on my vacc. gauge...)... But I run the Hyperpak intake...

I have also run a 600 Holley with annular boosters, but never had to run a secondary spring lighter than the brown one since it opened the secondaries enough during WOT to make the vacc. gauge go to almost 0 with the right amount of response...

I'm lucky to have a fair amount of cores and parts to work from, so Holley is very modular and I can swap a fair amount of parts from one carb to another if necessary, Edelbrock/Carter is not so lucky, but they do make a good carb that I can't complain about (when I had big blocks to run, the Carter always got good gas mileage over the holley, and was 'frugal' in gas consumption, but needed some 'odd' procedures to dial it in....)...

If you run a moderate lift cam (like the .435 lift area, with a short overlap, RV cam style, etc...), it will want a carb in the 500 cfm 2 barrel/450 cfm 4 barrel...stock 1972+ cam will like the 350 cfm carb (MAX) and the 390 with a secondary spring in the purple to plain region for mileage.... (I have a 450 cfm carb for the Hpak and I think that will average things out for 'mileage vs. needed power'...).


If you want to 'play' a gray area, keep searching your swap meets for a rebuildable Holley Model 2305 'Staged 2 barrel' 500 cfm....

good luck,

-D.idiot

My cam is .480 lift/ 264 adv.~224@ .050 with 110 LSA
So I probably could use a 600, right? (I'm trying to find a carb that will let my slant run, but I *Do Not* want a part throttle bog. Can a 600 give me that??

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225 Cubic Inches of Iron-Head American Muscle

225 bored .040 /.100 off block, Schneider Cam 224@.050~ .480 lift - Stock valves, blended bowls, Offenhauser intake with 500 Edelbrock carb

Bigblock,

Because I know how much DI and Argentina know I am embarassed to step in again, but fools' names and fools' faces are often seen in public places, as my mother used to say.

IMHO a bigger or lesser carburetor cfm, strictly speaking, isn't the root of an off idle bog. Rob (DI) and Argentina on this forum explained the basics (on this forum) of bog creation and it starts with YOUR engine. It seems as if nearly every slant is different, plus the platforms they are in and the feet stomping the gas differ. Still, if you look at Argentina's thread with lots of pics (he called it "not dialup friendly", look at cstryker's exploration of the reverse idle carb, and look at Rob's listing of parts he uses and has used, you can see something explored really well in Mike Urich's Holley book..That is, .the idle transfer slot "wetnes" in relation to the inches of vacuum in relation to which power valve you use, matched to jets, can remove or put in bog on ANY Holley.

For instance, My 4180 upgraded to 4150 following Rob's advice on springs and metering block was too rich with my selection of 10.5 power valve and 57 and 62 jets, but NO bog at all. In a heavy truck with a RV cam and a 3.91 and 4 speed.

I did the cardinal sin and changed TWO things at once, down to a 6.5 power valve and 47 jets. No bog at all, because engine would not even idle below 2,000 rpm and would barley crank without an ether shot! Had melted tires and run fabulous on the 10.5 and 57...So, I changed back to 50 jets and an 8.5 power valve. Runs fabulous, no bog, starts without really turning over.

It has to do with vacuum under primary plate and how much you have to expose the idle transfer slot to idle appropriately. Open plates up, initiate fuel flow in transfer slot, rich, = no bog. BUT, you have to set the idle speed screw underneath the carb base to spec, which is .025 (IIRC) between the throat and plate, and primary and secondary plates need to expose the same amount of transfer slot at that time.

My plugs read perfect now and I know I still can tune better, but I think I have wasted enough words here when others know tons more. DON'T jump on the 600 bandwagon just yet. I feel as if I want some cfm between the 390 I have now and the 500 I had with the Eddy, but below 75 mph I can't see a time difference in my truck and haven't had a chance to go faster. I am built for torque and life below 4,500 and it may be that those who want to live from 4,000 to 6,500 are gonna need more short term cfm, just like sprinters vs. marathoners.

But remember, I am just a beginner and am also still searching for the perfect recurve. I am close now on my curve, but changing jets, heads, and PV has changed my advance needs, I think. I am gonna find out by testing, and writing it down.

Regards to everyone,
rock
'64d100

Well, I'll throw my wrench in here...

FYI, I have run about 10-15 different induction systems on Slants over the last 18yrs.

Let me first shake things up by saying that I think the best all around street carb, that also performs really well on the strip, is the Holley 500 2bbl. Easy to tune, great throttle response, great mileage, great power. Seymour has used this carb to run 13s in his white Valiant, and ran a 350 2bbl deep into the 14s. I have run low 15s in a heavier street driver 68 Dart.

If you really want a 4bbl, then I vote for the 500 Eddy. I have also run a 600 Eddy, which worked well on a substantially more built motor than yours, but not as well on a medium build like yours. I ran a 500 eddy for several years on a high 15s/low 16s setup in a 3250lb raceweight car and it worked very well on the street. Unfortunately, I cannot comment on a 390 since the only one I ever tried was (I found out too late) modded for alky and never did run worth spit.

Clear as mud yet?

Lou

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Home of Slant6-powered fun machines since 1988

Al-l-l-righty then! Ya'll laid it out that time. I understood alot more that time.....it took a while to get through. Sorry guys. That's what is so great about this forum....people
Rock, that explanation was worth $$$, and I thank you for it.
Lou, That's the kind of stuff I like to read. Good to learn from others mistakes and success......
Thanks guys, I leave this thread alone now....

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225 Cubic Inches of Iron-Head American Muscle

225 bored .040 /.100 off block, Schneider Cam 224@.050~ .480 lift - Stock valves, blended bowls, Offenhauser intake with 500 Edelbrock carb

If you're part of the crowd, at some point in time, you will revisit this thought, and if the opportunity arises (say a 'deal' you can't pass up), don't ever be afraid to back up and 'take the road less travelled'.
I've learned more from the 'scenic drive' than just following the beaten path'. Good luck on your upgrade!

-D.Idiot

Update from the south

Swapped my 465 for a 390

Faster 1/4, better response by far, lower terminal in standing mile - to be expected.

49 Prim
52 sec
short yellow spring
65 PV

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Regards,
Fanie Gerber
It's never junk, it's just a part you're not currently using

http://www.valiant50.co.za
Just say I own a few Mopars