phat rat
Contributor
Posts: 323
Age: 69
Loc: muskegon mi
Reg: 09-02-09
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08-07-12 01:47 PM - Post#2256830
I'm considering a carb change. I've been using a Holley 750 #80508S and am considering going to a Holley Street Avenger 770 #80770. Does anyone here have any experience, good or bad, with the Avenger? This is for a 454HO,425hp,700R4, street driven not raced. OK occasionally raced. LOL
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 capricesport66
"3rd Year" Gold Supporting Member
Posts: 1208
Loc: Lafayette, Louisiana
Reg: 11-02-03
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08-07-12 02:18 PM - Post#2256843
In response to phat rat
What's the reason going from a 750cfm to a 770cfm?
Gerald
Lafayette, La.
http://www.flickr.com/photos/95648804@N08/
'66 Chevy Caprice 2DR HDTP 496/4L80e/3.73, 20's, Console, Buckets
'06 Chevy 2500HD 4x4 LBZ Duramax/Allison
'08 Toyota Highlander "Hybrid"
'99 VW Jetta TDI |
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phat rat
Contributor
Posts: 323
Age: 69
Loc: muskegon mi
Reg: 09-02-09
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08-07-12 02:33 PM - Post#2256851
In response to capricesport66
The old carb has been acting up lately and I was thinking about the Avenger because of what I'd read in their ads. The Avenger is available as a 570, 670, 770 and 870. I figured the 670 might be a bit on the small side. It depends on what chart/formula you use as to whether it is or not. Holley tech recommends the 770 and some charts/formulas would give the nod to the 670 .
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capricesport66
"3rd Year" Gold Supporting Member
Posts: 1208
Loc: Lafayette, Louisiana
Reg: 11-02-03
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08-07-12 02:38 PM - Post#2256853
In response to phat rat
Ok, if it's just a carb swap, then yes, the 770 is a good carb. I wouldn't hesitate to go with it.
I didn't know if you were having troubles tuning the 80508 or if you thought it was a bit undersized. Just wanted to hear the reason. The 770 is easily tunable and probably has all of the stuff you're looking for with the electric choke and such.
Gerald
Lafayette, La.
http://www.flickr.com/photos/95648804@N08/
'66 Chevy Caprice 2DR HDTP 496/4L80e/3.73, 20's, Console, Buckets
'06 Chevy 2500HD 4x4 LBZ Duramax/Allison
'08 Toyota Highlander "Hybrid"
'99 VW Jetta TDI |
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phat rat
Contributor
Posts: 323
Age: 69
Loc: muskegon mi
Reg: 09-02-09
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08-07-12 02:54 PM - Post#2256857
In response to capricesport66
Thanks for the input. The car IS driven, I've put as much as 8,000 mi on it in a month. Yes electric choke and vacumn advance are wants
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 MikeB
Senior Member
Posts: 9388
Loc: Plano, TX
Reg: 08-28-03
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08-08-12 06:16 PM - Post#2257299
In response to phat rat
I did a thorough cleaning and rebuild to stock specs of a very old 80508S carb last year. Biggest problem I found was clogged air bleeds.
When done, I installed it on a mild 350 in my pickup to make sure it worked well. The engine started quickly, idled smoothly, and ran flawlessly for a few months, until I sold the carb. No hesitation or any other problems. Secondaries engaged very smoothly. Choke worked like new.
I liked it so much, I bought its 650 CFM brother for my 55's 327. Both are very nice carbs that have been around for a long while. I'd bet yours can easily be restored to its original condition, unless it was ever modified using drill bits. 
A Holley renew kit costs around $45. Instructions are a joke, but I have a couple Holley books that helped me. Next time I will try an AED kit.
Real Hot Rods have a Clutch!
1955 210 2dr: 327, Brodix IK180 heads, Jones cam, Muncie M20, Wilwood front brakes
1969 C-10 pickup: 350, TH350
My car pictures
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Mr. Sinister
Contributor
Posts: 394
Age: 35
Loc: Fair Hill, MD
Reg: 05-18-09
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08-20-12 01:44 PM - Post#2261385
In response to MikeB
Street Avengers are GARBAGE.
My first one was replaced by Holley due to a defect in the casting process on the metering plates that caused them to corrode when they got hit with fuel.
The one they replaced it with had 3 of the 4 bolt holes on the secondary bowl strip on me. Not when I installed the bolts, but when I went to take them out to do a jet change. The threads came right out of the main body on the bolts, so it wasn't an issue of over-tightening them. I've had other carbs apart for jet changes and the like many times, and never stripped a single bolt or thread.
They're made on the cheap to be inexpensive, and it shows in my opinion. Spend a little more money and get a Street HP, they're worth it. Edelbrock will also work well on most street engines.
My experiences: http://www.chevytalk.org/fusionbb/showtopic.php?ti...
My post is towards the bottom of the thread here:
http://www.chevytalk.org/fusionbb/showtopic.php?ti...
Edited by Mr. Sinister on 08-20-12 01:45 PM. Reason for edit: No reason given.
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