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  600 cfm versus 750 carb for SB

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Author Topic:   600 cfm versus 750 carb for SB
Pierre
Gearhead

Posts: 366
From: France
Registered: Apr 2002

posted 06-27-2002 05:42 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
Can you guys help me out here: On one hand I hear that a 750 is WWWWWWWAY overkill on a 302 (unless your are reving the engine at 11000 RPM ), that unburned gazoline will run down the cylinders into the crankcase , that gas mileage will be really bad......(3310 Holley is the model I was recommended)

The other side says that to get full potential of a fairly beefed up SB, the A/F curve of a 750 is better suited.


Help me out here !!!


FYI, Here is the set-up:
302 bored .030
600 CFM edelb (Sorry Alex !!)
Performer RPM 302 Intake
EDEL heads Alum with 2.02/1.60
MSD-6A + vaccum advance Mallowry
Cam 214/224 @ .050 & .472/.496 lift

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68 S-code GT
Gearhead

Posts: 1129
From: Sayreville, NJ, US
Registered: Mar 2000

posted 06-27-2002 07:35 AM     Click Here to See the Profile for 68 S-code GT   Click Here to Email 68 S-code GT     Edit/Delete Message   Reply w/Quote
One of them street avengers might be a better Holley for your needs! I think they are available in 570, 670, 770 and 870cfm

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mellowyellow
Gearhead

Posts: 5739
From: So. Fl.
Registered: Aug 2000

posted 06-27-2002 07:41 AM     Click Here to See the Profile for mellowyellow     Edit/Delete Message   Reply w/Quote
I ran a 500 CFM Edelcrock on an 89 HO with ported E7 heads and B303 cam. Plenty of carb! I toook off a 600

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V8 Thumper
Gearhead

Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 06-27-2002 07:56 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
This will complicate things some:

I've also got a 3310, it's a real good one ... 4150 series 780. I also thought it'd be too much for my aluminum headed-solid cammed 333, until Dr. Denysenko set me straight It's similar to the OEM carb on Boss 302's

Pierre, I'm running a bit more cam and a few more cubic inches, but if European gasoline isn't too outrageously expensive for your budget, I'd say it's worth a shot. Vacuum secondaries only for a carb that big on a motor that small IMHO

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V8 Thumper
Gearhead

Posts: 3529
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 06-27-2002 08:00 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
I should however state that my motor is still on the stand, and not even in the car yet. I'm only offering what I've been recommended

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Pierre
Gearhead

Posts: 366
From: France
Registered: Apr 2002

posted 06-27-2002 08:31 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
The local "pro" also said vaccum secondary only !! Your reply did actually clear up things a bit, you are confirming some rumors that I heard around here.
But in a country with only a couple thousands stangs running, I've learned to take the local "pros" opinion with a grain of salt

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 06-27-2002 09:22 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Pierre, do you have a carb yet? If not and you are going to purchase one let us know. There are many more options available other than just the 1850(600) and 3310 (750)Holleys.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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Pierre
Gearhead

Posts: 366
From: France
Registered: Apr 2002

posted 06-27-2002 09:59 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
I presently run a 600 CFM EDEL (OK...... I know, it S*** ). As you probably seen in my posts, I am an average moron trying to optimize the tuning of my car by myself and have reach my limits !!
So I have decided to leave the job to a professional. One of them came highly recommended to me from all corners of the country.
Like you, he worships Holley and wants me to buy the 3310, he knows it best and tells me that he can definitely improve the perfs of my car. I was just very skeptical on the size he recommended.
Send me any input you have on the subject but I will probaly sticks with what he knows to make sure he does a good job

Plus 3310 is cheaper than Avengers and I am over 10K$ of parts on this car & my wife is approaching her limits.The back seat is not that confortable to sleep in

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 06-27-2002 10:04 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Go with the 3310 then. It is a much better choice and performer than the 1850 for your combination Pierre since there are budget considerations.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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mustangboy
Gearhead

Posts: 670
From: Ont, Canada
Registered: Mar 2002

posted 06-27-2002 11:43 PM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
I used a 3310 on my 302 for several years,worked great.I finally switched to a 650 DP but I'm also running a 4-speed and 4.11 gears.At the track the DP is a little quicker but the MPh is almost identical.I still throw the 3310 on from time to time as I actually prefer it for the street.

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Pierre
Gearhead

Posts: 366
From: France
Registered: Apr 2002

posted 06-28-2002 05:31 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
Mustangboy,

What's your street gas mileage with this set-up ?............Driving nice & gentle

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mustangboy
Gearhead

Posts: 670
From: Ont, Canada
Registered: Mar 2002

posted 06-29-2002 12:00 PM     Click Here to See the Profile for mustangboy     Edit/Delete Message   Reply w/Quote
I have no clue whatsoever what kind of gas mileage I get.My speedo is unhooked because the 4.11s threw it way out of wack so I have no way of telling how far I've gone.I use my tach to tell my speed.I use the car to go to shows and as a weekend warrior so it never goes to far from home so I'm usually just putting in 10 or 20 bucks of sunoco gold whenever I need it.I do know though that the mileage isn't good but this is mainly due to the gearing I believe.Sorry I couldn't be more help but I just wasn't concerned with gas mileage when I built this car.

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DidgeyTrucker
Gearhead

Posts: 1060
From: Greenbrier, TN USA
Registered: Oct 99

posted 06-29-2002 03:33 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
For what it's worth:
I replaced the stock 2V on my 351C with a 4V (3310-1 - a real 780) and Edelbrock 351-2V dual plane manifold.

I haven't done the math yet, but the gas mileage doesn't seem to be any worse than the 2V.

But the acceleration is another story!

Tracy

------------------
Tracy M&M #245
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Don't focus on the destination....make the JOURNEY the adventure
Visit my Web site: DidgeyTrucker's Website

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H8CHEVY
Gearhead

Posts: 276
From: Southern Cali
Registered: Jun 2000

posted 06-29-2002 05:12 PM     Click Here to See the Profile for H8CHEVY   Click Here to Email H8CHEVY     Edit/Delete Message   Reply w/Quote
hey Alex, just a thought, if you were running Pierre's motor, and not worried about cost of carb nor gas milage, what carb would you put on this motor?

------------------
"In the wise words I was once told bye Jiggy"

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Fastback68
Gearhead

Posts: 1746
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 07-01-2002 04:08 AM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
I hope Alex drops by here again, 'cos I'd love to know too. Money no object, what is the best carb in the world for a mildly built 302, weekend warrior, no drag strip stuff but a fair amount of stop light work? For me, ease of tuning would also be a consideration 'cos I am a bit dumb in this area

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 07-01-2002 02:14 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Toss up here. First choice would be a well done Autolite 1.12 4100, BUT....due to the high cost and difficult availability of tuning parts, I would use a Holley Avenger 670 for a "STREET" mild 289-302.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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Fastback68
Gearhead

Posts: 1746
From: Sucat, Paranaque, Philippines
Registered: Jul 99

posted 07-01-2002 09:20 PM     Click Here to See the Profile for Fastback68   Click Here to Email Fastback68     Edit/Delete Message   Reply w/Quote
Thanks Alex! I have that Autolite, but it's not "well done" or even complete. Are you still doing overhauls on them for your customers? I'm coming to the US for two weeks in September. If I UPS it to you as soon as I arrive, could you turn it around for me?
Simon

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 07-01-2002 10:44 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Sure Simon. No problem.

------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl

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