I was hoping someone could tell me what carb I have. I went to the Holley page and tried to find my #s there but to no avail. http://www.chevelles.com/forum/frown.gif I was told it was a 650 Double Pumper but I am thinking it is a 750. Here are my #s

6931
3310-4 ( I found 3310-S on the Holley page)
1296
10569
Thanks in advance if somebody can help me.

You have a holley 3310. The -4 represents the configuration of the carb as shipped by Holley. You have a medium spring kit and medium jet's. This is the same carb that I use on my ZZ4. I was given this info from the holley parts book which describes the variation's.

I don't have access to my info right now to give you more details.

Hope it helps.

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Canadian ZZ4 Powered 64 Malibu SS!
Team Chevelle Gold Member #37
WebSite http://www.magma.ca/~ssoltesz/steves/1964.htm

Thanks for the insight but is it a 650 or 750? Thats my biggest question.

650 dp has straight venturi boosters, 4777 on air horn, 750 dp has dogleg boosters, 4779 on air horn. Baseplate is identical.
I don't know what 3310 is.
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www.geocities.com/lonnie67_1966 (http://www.geocities.com/lonnie67_1966)

[This message has been edited by Lonnie67 (edited 07-29-2000).]

3310's with any type of a dash number (-1,-2...-A,-B...) are 750's. Early 3310's with no dash numbers follwing it are 780cfm. I have a 1965 3310 (with no dash number) and it has the chevy factory serial stamped into the air horn as well. It's a 780 cfm with vacuum secondaries and dual metering blocks but with mixing screws and accelerator pump for the front bowl only. This means it's not a "Double Pumper". I also have a model 4779 (which I think equates to a list number of 3310-1)with mechanical secondaries, dual metering blocks, mixing screws on both front and back bowls (four total)and front and back accelerator pumps. Correct me if I'm wrong, but doesn't the term double pumper mean that you have dual accelerator pumps? So your carb should have one or the other of these setups. By the way, both these setups use the dual fuel line setup. Most poeple think that because they have a dual fuel line they have a double pumper, but that's not the case.

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Armando
So. Cal
66 Malibu,454,M22
64 El camino
57 Bel Air
95 Impala SS

See below.

[This message has been edited by IgnitionMan (edited 07-29-2000).]

No 3310 or any of its derivitives will ever be 750 cfms from Holley, not going to happen. The cfm number is done at a different vacuum depression rating to equalize numbers for sales. Nobody wants an 800 cfm carb if is more money than, say, a 780, so - Holley just reflowed the same carb (flow benches have holes to regulate the pressure depression they read at, more or less holes plugged measures the flow at a different rate), got the 750 rating and is now a "750" cfm, same base, same plates, same body and venturi size, same booster venturi size all equals SAME 780 cfm, nothing different.

Only design difference in the original 1965 Chevelle 396/375 Z16 the first 3310 came on, and dash 3310s, is the latter dash carbs use a secondary plate inside the float bowl for jetting and different secondary short nitropyl float, and not the original 3310 secondary metering block with same float as brass front.

If Holley had made a "750 cfm carb from the 3310, it would definately have a different LIST series number, not a dash suffix.

Also, NO DOUBLE PUMPER WAS EVER A 3310 of any sort, never, period. Although the 3310's were DUAL FEED, they weren't double pumpers. 4779 carbs weren't ever a vacuum secondary carb, I.E., not a 3310.

I do agree with Mondo454, though, most people who don't have the experience with Holleys think if it has dual fuel feeds and cathederal style bowls, it would be a duoble pumper, but the vac sec carbs aren't.

Just clarifying the widespread mis-information on List 3310AAS and their offshoot dash carbs.

I just read a reerence today that implied the first 780 vac sec had two accel pumps. That must be an odd bird.

?

[This message has been edited by Gene Chas (edited 07-30-2000).]

Gene, 3310's have always been vacuum secondary carbs, single accelerator pump, dual fuel inlet. Holley never built a double pumper with vacuum secondaries.

The 3310 has been a carb that has always had lots of controversy on just what is what, and lots of mis-information. They are all 780 cfm, no matter what flow rate they are measured in, always vac sec, never double pumpres, just a real good carb (it should be, it started on a Z16) works on just about everything from stock ZZ4 to moderate big blocks for everyday driving.

Take care, my friend.

That was some great info IgnitionMan! I always appreciate someone with more knowledge. http://www.chevelles.com/forum/biggrin.gif

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Armando
So. Cal
66 Malibu,454,M22
64 El camino
57 Bel Air
95 Impala SS

In this post IgnitionMan stated that "Holley never built a double pumper with vacuum secondaries" - my question is, what makes a carb a double pumper? I thought all Holley's were double pumpers.

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Thanks,
ccrider
Member #:267
ACES Member #:3379
66 Chevelle SS



[This message has been edited by ccrider (edited 09-08-2000).]

Simple, all Holley double pumpers had accelerator pumps front and rear. If you have a single pump in front, you obviously don't have a "double" pumper. Don't confuse "dual feed" with "double pumpers."

I do have a question for IgnitionMan: If Holley got a 750cfm flow by manipulating the flow bench, wouldn't it be a 750? Why would Holley (and all their resellers) avertise it as a 750 if it's really a 780? If the dash series is (basically) the same carb as the older 780's, why advertise it as something less?

Holley even advertises it as a 750 on their website. The "new" 0-3310S is listed as a 750cfm and is a model 4160; the "original 3310" is a model 4150, rated at 780cfm and is part number 0-9188 and came on the 1965 396/425 - according to Holley - but according to Chevrolet, the R-3310A came on the 65 396 Chevelle which was rated at 375hp.


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Dale McIntosh
ACES #1709
Team Chevelle #92
www.dalesplace.com (http://www.dalesplace.com)

[This message has been edited by Dale McIntosh (edited 09-10-2000).]

Thanks Dale, I had the same question myself.
I am looking at a new Holley 780 (3310, model 4150, Holley part# 0-9188 - is this a good carb for my 66 SS with 402-BB? I've heard a lot of good things about this carb but would a double pumper 750 or 800 with mechanical secondaries be a better fit??


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Thanks,
ccrider
Member #:267
ACES Member #:3379
66 Chevelle SS

Hey guys,

Could the difference in advertised flow rates be the booster configuration - straight leg vs down leg?

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It’s a BIGger BLOCK!

So in other words I-man, holley's tactics are primarily used as a marketing tool to boost sales right? Misrepresenting an actual 780cfm carb for a 750cfm. Huh, kind of misleading don't you think?

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70 Chevelle(408ci,TH350,3.73's)
78 Camaro Z28(350ci,4spd./M22,3.73's)
Team Chevelle #665
STEVO-70 (http://home.utah-inter.net/marcel)

Steve, welcome to big business brother.

Think back to the times of the original run of double pumper performance Holleys. Would you pay almost twice as much for an 800 cfm carb for your street zoot than for a comparable 780 cfm carb, not knowing the difference between vac and manual secs?, 1 vs 2 accelerator pumps, both have cathederal type bowls and look exactly the same to the novice carb user, Heck No! You'd save the bucks, Buck Rogers, sagging the D/P sales in the process.

What Holley did was two different things with subsequent carbs, the 3310 series was flowed to be a real 780, then, when the double pumper comes out, the sales went bad on the D/P, so, engineering flowed the carbs down to get a considerably lower sales flow number, and the D/P was a go.

Later carbs, as the ones mentioned, with non-3310 numbers, are actually reduced venturi, changed booster carbs, and do actually flow 750 cfms.

There are two different 3 barrel Holley carbs, 2 round primarys, 1 oval convolute secondary, only one. Two different flow rates, 950 and 1050 cfm. Diff is 950 has secondary booster venturis like a regular 4 hole carb, 1050 has two dump tubes (like a Q-jet) and no boosters for fuel delivery from sec jets. Taking the boosters out of the sec body allowed for 100 more cfm flow.

Anything that isn't a 3310 is different from a 3310. Plain and simple.

[This message has been edited by IgnitionMan (edited 09-14-2000).]

[This message has been edited by IgnitionMan (edited 09-14-2000).]

Thanks Ignition man I just e-mailed this page to a friend that was telling me that 3310's were 750 not 780's as I was telling everyone!

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johnnyr

OK - let me see if I understand this:
Holley took the 780cfm 3310 carb,did some Voodo engineering and called it a 750cfm. It has vacuum secondaries and one accelerator pump, and they did all this to improve the sales of the 800cfm double pumpers because the 780 was much cheaper than the 800's.

Now someone tell me which 1965 Chevelle had a 396/425hp engine.

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Thanks,
ccrider
Member #:267
ACES Member #:3379
66 Chevelle SS

Cool Holley 101
I'm learnin alot here
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JARRET GRATHWOL
TEAM CHEVELLE MEMBER #573
1970 Chevelle SS 396/ M-21
You can see my Chevelle SS here:
http://www.geocities.com/stangsvt99/Jarret_s__70_Chevelle_SS.html

[This message has been edited by Jarret Grathwol (edited 09-15-2000).]

Actually, the real output of the Z-16 was at or very, very near 425, as the Corvette engine was. The only thing that restricted the Z-16 was the 50 horsepower robbong stock 396/325 exhaust manifolds they used on it. Even with the hydraulic cam, the engine made great numbers when headers were fitted.

So, yeah, the 1965 396 was close to 425 horses in reality, kinda-sorta.

I have a 3310 that is "supposed" to be one of these Z-16 carbs, but no one has been able to tell me if it is. I'll go home this evening and get the numbers off the air horn and post it here and see if one of you guys can tell me if it is. I was running it on my 66 with the 454 and was great. I removed it, baged and boxed it up and bought a brand new 4779 to replace it. Anyway, I'll post those part numbers later.

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Armando
So. Cal
66 Malibu,454,M22
64 El camino
57 Bel Air
95 Impala SS

Well I just received my 3310 yesterday. They are rather hard to find but I got one from www.carpartsonsale.com (http://www.carpartsonsale.com) that was ordered and never picked up. So I'm going to see how this bad boy works - out of the box. Any suggestions??

BTW, after all that "marketing" slight of hand by Holley, you can now buy a Holley Classic Double pumper, 800cfm, gold finish, from JEGS for $359.00; the 780cfm (3310) lists everywhere I checked at over $400. Paid $421 for mine.

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Thanks,
ccrider
Member #:267
ACES Member #:3379
66 Chevelle SS

I've got one of those "funky" 3 bbl carbs,
the 950 cfm version, sits on the shelf and works great http://www.chevelles.com/forum/rolleyes.gif

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RicksRag
Stephen City, Va
TC # 560
ACES # 3702

http://www.chevelles.com/forum/rolleyes.gif My brain hurts http://www.chevelles.com/forum/rolleyes.gif

Chevy used the 780 Holley on all their solid lifter motors except the L88 and ZL1. The latter two used the 850 double pumper. The carbs for the L78 and L72 motors had small distribution tabs in the venturis to divert a little more gas in the direction of the cylinders that tended to run lean. Check out a 3959164GE carb for these tabs.
It is pretty easy to tell a double pumper carb. It will have mechanical secondaries, accelerator pumps on both float bowls, will not have the big secondary vacuum diaphram which opens the secondaries on the 3310 carbs. It won't have a 3310 designation either.

Got my 3310 installed and it made a huge difference in performance over the original 650 dbl pumper. Only change I made was to convert the manual choke to electric.