The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 04-27-2020, 11:15 PM   #1
fdbdw
Registered User
 
fdbdw's Avatar
 
Join Date: Jan 2009
Location: colorado springs
Posts: 479
Carb size 454bbc

Spent hours on the internet researching and I’m still no closer to a decision.
New 454 crate motor with headers.
Currently running an Edelbrock AVS2 650cfm that was on my old motor,wondering if I should go bigger.
I’m going to stick with Edelbrock because I have a ton of rods, jests, springs for tuning but mostly because I have a performer RPM fuel pump and would have to replace it to run a Holley.
Choices I’m looking at: Performer 750 cfm and AVS2 800cfm , mainly considering the 800 because I like the AVS2 and that model doesn’t come in 750.
What’s your thoughts, do I need a bigger carb?
fdbdw is offline   Reply With Quote
Old 04-27-2020, 11:31 PM   #2
HO455
Post Whore
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 10,752
Re: Carb size 454bbc

How are you planning on using the 454?
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Old 04-27-2020, 11:51 PM   #3
68bowtie
Senior Member
 
68bowtie's Avatar
 
Join Date: Jan 2007
Location: Turlock, CA
Posts: 8,237
Re: Carb size 454bbc

Summit has a good calculator. Street vs strip use will make a difference.
__________________
I live in California, but identify as a Texan
"If a job's worth doing, it's worth doing well"

Project "Little Sister" (70 c10 blue original paint refresh)
Project "C10 Fever" (68 factory black 396 swb)
Project "Blue Bomb" (70 c30 blue original paint refresh)
Project "Vitamin C" (71 c10 orange original paint refresh)
68bowtie is offline   Reply With Quote
Old 04-27-2020, 11:56 PM   #4
fdbdw
Registered User
 
fdbdw's Avatar
 
Join Date: Jan 2009
Location: colorado springs
Posts: 479
Re: Carb size 454bbc

Quote:
Originally Posted by HO455 View Post
How are you planning on using the 454?
I don’t run it on the strip, I drive it a lot and want to take advantage of available power without compromising streetability . 500 mi and first oil change so today I opened it up for the first time and seemed happier when it was being fed .
fdbdw is offline   Reply With Quote
Old 04-28-2020, 12:07 AM   #5
HO455
Post Whore
 
HO455's Avatar
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 10,752
Re: Carb size 454bbc

For the most part GM put 750's on the early 454's and then in the mid 70's they went to 800 cfm. They were all Qjets. If you like the AVS carbs go with one of them. I wouldn't think twice on putting an 800 on a 454.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.
RIP Bob Parks.
1967 Burban the WMB,1991 S(stink)-10 Blazer,1969 GTO, 1970 Javelin, 1952 F2 Ford 4X4, 29 Model A, 72 Firebird. 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
HO455 is offline   Reply With Quote
Old 04-28-2020, 01:31 AM   #6
kwmech
Senior Member
 
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,355
Re: Carb size 454bbc

Got a 650 on my mildly built 454, runs great, but with the 4 speed it rarely goes over 4k. It gets there pretty quick though. Pulls strong from about 1800 up until I shift. That is on my 68 gmc. My 69 GMC flatbed with just about the same build, I put a 750 on it because it will pulling heavier loads and has an automatic and may see a few more rpm just for fun. No headers on either one, both have cast iron manifolds with a single 3'' exhaust
kwmech is offline   Reply With Quote
Old 04-28-2020, 01:12 PM   #7
weim55
Registered User
 
Join Date: Jan 2017
Location: Larkspur, Colorado
Posts: 904
Re: Carb size 454bbc

Does your 454 need a bigger carb? Going by the book, yes. 800AVS would be a good choice if it’s a typical mild street 454. That said if It’s my money being spent I’d stay with the 650. You might gain 20-30 horsepower at the very top end of the RPM scale (5000rpm+). Other than that, zero gain or difference, particularly at our high altitude.

Steve weim55 Colorado
weim55 is offline   Reply With Quote
Old 05-15-2020, 03:42 PM   #8
fdbdw
Registered User
 
fdbdw's Avatar
 
Join Date: Jan 2009
Location: colorado springs
Posts: 479
Re: Carb size 454bbc

Update
Installed the AVS2 800 today and I couldn’t be happier. Stronger from A-Z , crisp and solid from off idle, mid and WOT. I was really worried about losing low end but it feels great all around, the motor even sounds smoother. Just wanted to update, I appreciate all the input.
fdbdw is offline   Reply With Quote
Old 05-15-2020, 04:29 PM   #9
70'
Registered User
 
70''s Avatar
 
Join Date: Nov 2014
Location: Dickinson, ND
Posts: 197
Re: Carb size 454bbc

I have a 468 BBC with headers and a performance cam that dyno tested at 500hp. I am running an air gap Edlebrock intake and a holly 670 street avenger carb. Very steerable combo, with a nice reliable idle, and smooth acceleration thought out the range but when you decide you want to get after it, it definitely gets after it. I know you wanted to stick with Edelbrock so just threw the info out there so you might find an equivalent. Good Luck.
70' is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:32 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com