750 double pumper vs 770 street avenger - Team Camaro Tech
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post #1 of 13 (permalink) Old Feb 2nd, 08, 02:09 PM Thread Starter
 
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750 double pumper vs 770 street avenger

After having my 750 rebuilt and tweaked several times, I'm read to scrap it and get a new one. I've narrowed it down to a Holly 750 double pumper vs a 770 Street Avenger. Which would recommend?
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post #2 of 13 (permalink) Old Feb 2nd, 08, 03:01 PM
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Re: 750 double pumper vs 770 street avenger

Really depends on what car it is going on. If it is going to be used on the street at all then go with the Street Avenger with Vacuum Secondaries it can't be beat. If it is a track only car then the Double Pumper makes sense then.

Don't underestimate the value of vacuum secondaries for street use.

Ed

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post #3 of 13 (permalink) Old Feb 2nd, 08, 06:32 PM
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Re: 750 double pumper vs 770 street avenger

is your car a auto or a stick?
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post #4 of 13 (permalink) Old Feb 2nd, 08, 08:23 PM
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Re: 750 double pumper vs 770 street avenger

Very vew with DP's wish they had a vacuum secondary carb, myself included.
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post #5 of 13 (permalink) Old Feb 3rd, 08, 01:27 AM Thread Starter
 
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Re: 750 double pumper vs 770 street avenger

My car is automatic (3 speed) with 3.08 rear gears. I also wonder about to 870 street avanger.
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post #6 of 13 (permalink) Old Feb 3rd, 08, 10:06 AM
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Re: 750 double pumper vs 770 street avenger

Here is a link to Holley's PDF on Carb selection:
http://www.holley.com/data/TechServi...Carburetor.pdf

Quick Reference guide:
http://www.holley.com/data/TechServi...0Reference.pdf

Also here is a direct link to a Holley's online tool for Carb selection (kind of cool)
http://www.holley.com/applications/C...bSelection.asp

It is very hard to beat the drive ability on the street of a Vacuum Secondary carb with a vacuum advance distributor. Now on the track is a different story, but on the street we don't spend nearly as much time at WOT as we do at part throttle. WOT is where a double pumper really starts to shine over vacuum secondaries, so it really all depends on what you are doing.

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post #7 of 13 (permalink) Old Feb 3rd, 08, 04:12 PM
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Re: 750 double pumper vs 770 street avenger

I've ran both the 750 DP and 770 Avenger on my 454/525HP 5 spd 3:90 Chevelle, and I decided to keep the Avenger...it gives nothing up to the DP.

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post #8 of 13 (permalink) Old Feb 3rd, 08, 07:32 PM Thread Starter
 
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Re: 750 double pumper vs 770 street avenger

I'm leaning toward the 770 street avanger.
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post #9 of 13 (permalink) Old Feb 3rd, 08, 08:42 PM
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Kevin
 
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Re: 750 double pumper vs 770 street avenger

Quote:
Originally Posted by 68fan View Post
I'm leaning toward the 770 street avanger.
Have you even mentioned engine size?

Learning & Relearning about the cars I grew up with.
69' - Built 350, 750 Holley, Elgin E920P Cam, 283 PP Heads, Long Comp Headers, MSD, TKO-600, 12 Bolt Posi 3.73, Hotchkis Rear, Eibach Front w/Hotchkis Sway, SPC UCAs, 3rd Gen PS, AR TTII's. Still working on it.
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post #10 of 13 (permalink) Old Feb 3rd, 08, 10:04 PM
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Re: 750 double pumper vs 770 street avenger

Quote:
Originally Posted by dbx1969 View Post
Have you even mentioned engine size?
I was just thinking the same thing. Although it wouldn't change my suggestion on going with the 770 vac. sec. But it would influence size. I'm assuming big block. But if it's a small block then go 670.


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post #11 of 13 (permalink) Old Feb 4th, 08, 09:31 PM Thread Starter
 
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Re: 750 double pumper vs 770 street avenger

396 350hp
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post #12 of 13 (permalink) Old Feb 4th, 08, 09:45 PM
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Re: 750 double pumper vs 770 street avenger

Holley 3310 or 770SA

69 Camaro
491/AFR 315'S/Straub hyd roller
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post #13 of 13 (permalink) Old Feb 4th, 08, 10:08 PM Thread Starter
 
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Re: 750 double pumper vs 770 street avenger

I'm Going With The 770 Street Avenger
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