what carb to put on 670 770

[NOPHO84K30]

Im looking at the truck avenger carbs its going on a stock 454 with headers and edelbrock intack. The motors prety tired dosent smoke. but at idle has like 5 psi oil pressure running down the road has 30 . I have a 750 edl on in now theres just not alot of power. is 750 to big or right

 

[Driver4r]

750 is PERFECT for a factory big block, put an older Q-jet on it......... Befor the computer controlled ones.

 

[Boone83K10]

750 is good but anything will run like doodoo if not tuned properly.

 

[Stroked]

Holley's interactive carb selector actually recommends around a 650 cfm for a stock 454. So does Summit.

But don't take my word for it, try it out yourself

http://www.summitracing.com/expertadviceandnews/calcsandtools/cfm-calculator

http://www.holley.com/applications/CarburetorSelector/CarbSelection.asp

 

[Mr Clean]

I run a 750 on mine, but I have a RV cam, motor in 30 over, and heads have been worked on a bit.

 

[thatcanuckguy]

600-650 on a stock 454. if you run a 750, you will defineately need to jet down. too much carb isnt good. summit makes a fantastic carb. i run them on all my customs.

 

[Stroked]

600-650 on a stock 454. if you run a 750, you will defineately need to jet down. too much carb isnt good. summit makes a fantastic carb. i run them on all my customs.

No kidding? I've been eyeballing that carb for a while. Seems to have good reviews.

 

[thatcanuckguy]

No kidding? I've been eyeballing that carb for a while. Seems to have good reviews.

yes, they are prolly one of the best out there. fully adjustable in every way. they also perform flawlessly right out of the box. it is actually a holley carb. summit bought the pattent and the rights off of holley because it wasnt a big seller for them. it was the "v-rod" for holley and the diehards dont like change. so summit bought it and its been an awsome seller for them. i have 7-8 friends running them as well, on everything from vettes to boggers. all the parts are all holley, so if you need different size jets, order a holley kit. the tuning dvd is a great little freebie. heres a 750 on 468 in my stepside. great looking carb as well
http://www.gmsquarebody.com/forum/attachment.php?attachmentid=15827&stc=1&d=1386937759

 

[Turd427]

My big block dyno'd at 573hp so I went with the 770 truck avenger. I have a holley 850 double pumper on my chevelle with a big block so I thought this would be perfect. After a month of guessing I finally called holley and talked to the "dude" for truck avengers. he told me the 770's are for big motors (750+hp) and actually exchanged my 770 for a 670 for no cost. That was a big props to the customer service of Holley. Bolted it on and cured all my too rich issues. It runs so well I've had to pop my hood out on wheeling trips to prove to people I don't have FI. It's a great carb and my truck runs on its side with it.