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 Carburetor selection?
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deez nuts
Buffalo

67 Posts

Posted - 08 Dec 2016 :  9:35:02 PM  Show Profile  Reply with Quote
Building a 461 stroker. Ported stock heads aluminum intake HFT cam 228/235 @ .050. lift is somewhere near 480/490 (can't remember exact lift). Engine is going in a 77 T/A with a Borg Warner 4spd and 308 rear. Mostly a street car but might see some track time. Goal is to be 400+up at the crank.

Which of these 2 carburetors is the better choice for my 461? Running pump gas and street manners are probably more important. Still want it to rip though.

750cfm vac sec manual choke 3310 series
http://www.jegs.com/i/Holley/510/0-3310S/10002/-1

Or

770 vac sec manual choke street avenger series
http://www.jegs.com/i/Holley/510/0-81770/10002/-1

*Price difference between the two isn't enough to concern me...


Thanks for the help!

GtoGuy32
Cochise

USA
842 Posts

Posted - 08 Dec 2016 :  11:16:00 PM  Show Profile  Reply with Quote
Are you dead set on vacuum secondaries?

I would go for a Holley 4150 double pumper given the displacement and 4 speed (and that you might race the car).

I have used the street avenger carb on two setups and won't use them again on any sort of a performance build, as I had one with a bad metering block and I just don't feel the quality is there compared to other Holley offerings.

I have a carb built by AED and love it. All I do is jet it up and down depending upon the air quality at the track.
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deez nuts
Buffalo

67 Posts

Posted - 09 Dec 2016 :  09:49:14 AM  Show Profile  Reply with Quote
Yes I want vac sec since the car will see way more street use than track time. I definitely see taking the car on a 3-4 hr drive to the beach or to work.

Just seems like vacuum secondary will be better for the driving that I'll do the most
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 09 Dec 2016 :  10:06:18 AM  Show Profile  Reply with Quote
There's no difference for normal street driving and cruising to the beach etc., as the double pumper carbs are progressive just like the Vac sec carbs. But you have way more control of things and don't have to deal with slow reacting vacuum secondaries which can't keep up with your manual shifting.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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Steve C.
Crazy Horse

1672 Posts

Posted - 09 Dec 2016 :  10:33:33 AM  Show Profile  Reply with Quote

Vacuum-Or Mechanical-Secondary Carburetor?

http://www.hotrod.com/articles/vacuum-or-mechanical-secondary-carburetor/
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deez nuts
Buffalo

67 Posts

Posted - 09 Dec 2016 :  5:35:52 PM  Show Profile  Reply with Quote
I just talked to the guy doing my heads and he recommended a 750 double pumper style with mech secondary. Am I going to be making a good choice with a Holley 4150 double pumper?

I thought a vac secondary would be better for my application but if I'm not gaining mpg and strert manners then I guess not.
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Phil
The Great White Buffalo

USA
7214 Posts

Posted - 09 Dec 2016 :  6:38:33 PM  Show Profile  Reply with Quote
Assuming of course the correct tune for both, the mpg thing is more related to people not being able to keep their foot out of the mechanical secondaries.

Bowties are for Pee-wee Herman. "Chevy": even the name sounds cheap, but not as cheap as your Pontiac will be with an LS transplant.
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deez nuts
Buffalo

67 Posts

Posted - 09 Dec 2016 :  6:50:29 PM  Show Profile  Reply with Quote
Okay well then I'll probably get crap mpg because I'll want to romp on it lol

Looks like a factory refurbished Holley 4150 750cfm double pumper can be had for $350.00. seems like a good way to go.
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Steve C.
Crazy Horse

1672 Posts

Posted - 09 Dec 2016 :  6:52:14 PM  Show Profile  Reply with Quote
How many anticipated miles per year ? Compare the small MPG difference between the two types and look at the impact on the costs.

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deez nuts
Buffalo

67 Posts

Posted - 09 Dec 2016 :  9:20:15 PM  Show Profile  Reply with Quote
That's true I guess mpg doesn't really matter since I'll probably only drive it one day a week.
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GtoGuy32
Cochise

USA
842 Posts

Posted - 10 Dec 2016 :  05:17:42 AM  Show Profile  Reply with Quote
Go with the 4150 DP and you won't ever look back. If you said you were putting it on a big Bonneville cruiser with and automatic and 2.73 gears, I'd consider vacuum secondaries, but not for your application.

Screw gas mileage....you're gonna have your foot in it anyways...
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deez nuts
Buffalo

67 Posts

Posted - 10 Dec 2016 :  08:07:05 AM  Show Profile  Reply with Quote
Alright I'm sold, going to order a remanufactured 750 dp when I have the engine almost together.

Thinking I'll go with an edelbrock fuel pump. Edl-1713 is the summit part number I think. 110gph and 6psi. Best way to go with the 750dp?
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GtoGuy32
Cochise

USA
842 Posts

Posted - 10 Dec 2016 :  6:10:16 PM  Show Profile  Reply with Quote
I have used that pump on a mild performance build with no problems at all..

Sounds like you have a good plan!
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deez nuts
Buffalo

67 Posts

Posted - 06 Jan 2017 :  11:39:54 PM  Show Profile  Reply with Quote
http://m.ebay.com/itm/750-Holley-double-pumper-carb-carburetor-4779-4-crnr-idle-REMAN-/201769512491?hash=item2efa666e2b%3Ag%3ARvkAAOSwImRYaYVx&_trkparms=pageci%253A6a7a3e38-d45a-11e6-8541-74dbd18007ba%257Cparentrq%253A75c4c94d1590a7873086db77ffbdd7e5%257Ciid%253A7

Is this a good choice or should I track down one with a choke? I live in central Pennsylvania
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GtoGuy32
Cochise

USA
842 Posts

Posted - 08 Jan 2017 :  11:24:52 PM  Show Profile  Reply with Quote
No need for a choke, unless you plan to drive it in super cold temps and dont want to give it time to warm up.

I live in Massachusetts. I havent had a choke on my cars for years.

That carb will work, also.
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DanM
Buffalo

80 Posts

Posted - 21 Mar 2017 :  4:02:31 PM  Show Profile  Reply with Quote
Use of a choke is a convenience thing I suppose. Some people may consider it a luxury. Mine didn't work for several years. Eventually I got over the fear of that little curly metal choke stove thing and fashioned myself a choke rod out of clothes hanger.

Oh my goodness I am so glad I did that. It starts in any weather but most importantly I don't have so sit and wait for the car to warm up completely before pulling away and no more gas-brake routine. It's like my car is fuel injected.

71 LeMans Sport Convertible with 310,000 miles driven year round since 1994.
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tjs44
Cochise

USA
410 Posts

Posted - 21 Mar 2017 :  6:29:25 PM  Show Profile  Reply with Quote
461 with that little cam you dont need anymore than a stock intake and QJ.JMHO,Tom
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