View Full Version : carb on a 77 Jimmy - 350

06-25-2005, 11:16 AM
time for a new carb on the old 77 jimmy with a 350.

I will soon be putting on an edelbrock performer manifold and going to 2.5" or 3" exhaust. I've been looking at the Edelbrock AVS offroad 650 carb and am wondering what anybody knows of that carb or can recommend a better carb. I do mostly trail riding, crawling, etc. and very limited mudding(I hate the cleanup afterwards). I want as much horsepower and torque possible without a total engine rebuild. I believe the 350 already has an RV cam in it and flat top or domed pistons(ah, the pleasures of buying a used motor).

any suggestions would be great. thanks:)

06-25-2005, 11:36 AM
i'd run that carb.. i have a crappy holley right now... DO NOT buy a holley carb..

run 2.5" dual exhaust witht he last 3 ft of pipe 3"



06-25-2005, 11:40 AM
id go with 3 inch. I can probably get you a super 40 series from lordco for 75 bucks if you want one, i just out one on my truck...

1992 Full Size Blazer, 31" A/T's, Stock Drivetrain
Soon to Come:
12" Lift, 38.5's
Solid Axle Front End
Corp 14 Bolt Full Floater Rear End

06-25-2005, 12:16 PM
I get great prices at lordco through my shop, thanks though.

I'm thinking this is the carb to use, but before I drop a pile of money I want to make sure it's worth it.

the exhaust comes later, perhaps in a month. I'll keep you posted

06-25-2005, 12:18 PM
wont get enough back pressure for crawling with 3"....

for mud yeah it'll work fine but for crawlin and such need backpressure



06-25-2005, 12:23 PM
Get a Q Jet, and there is no such thing as not enough back pressure, except an engine that has a back pressure egr valve.

06-25-2005, 01:26 PM
I'm unhappy with the q-jet. could be because I did a half-assed rebuild on it then ran a 300k offroad journey in dust with a shitty K&N filter.

considering the price it would be cheapest to just get a rebuilt autoline q-jet, but I'm playing with the idea of getting an aftermarket higher performance carb.

as for back pressure, yeah, most likely just stick to the 2 1/4 or or 2 1/2 pipe.

06-25-2005, 02:40 PM
Then get an Edlebrock Performer RPM

It's a Q Jet

06-25-2005, 02:43 PM
I can get you a good deal on an Off Raod Holley, new in the box.
Or an Edlebrock Performer, also known as a carter afb.

06-25-2005, 08:47 PM
fuck the junk and go propane and build a motor that could use 4" sewer pipe[:o)]like a big block!!!!grow up all ready

Better than a Ford but not quite a Lincoln

m j
06-26-2005, 05:27 AM
Quadrajet is the best carb offroad

Propane is the best way to go

I am trying to feel sorry for you but I just can't seem to do it.

06-26-2005, 07:19 AM
how are the autoline q-jet rebuilds?

06-26-2005, 02:28 PM
picked up the performer manifold and a q-jet with matching numbers to my current carb, now we'll see if it runs a little better.

next on the list, exhaust and roller rockers

control world populations, eat your young.

06-26-2005, 03:32 PM
Good choice in the Qjet, I run one on my ford and it works great, I've had the truck allmost on its side and it was running fine.

Image Insert:

Punk in Drublic
06-27-2005, 07:36 AM
yea i was also thinkin of swithcin out my peice of shit holley for a Q jet.

fetus: its like veal but human

06-27-2005, 08:45 AM

06-27-2005, 04:12 PM

I shall, one day

not this day
or this year
but soon, if not eventually

control world populations, eat your young.

06-27-2005, 09:11 PM
a good working q-jet is the most reliable way to go and compared they are pretty cheap

wat i've seen with the off-road holley they seem pretty good to but more pricy

had an edelbrock and have a friend who runs 1 also and they are *#*#*## shit

06-27-2005, 09:22 PM
I like the q-jet design with the smaller main barrels and the large secondary barrels. She sips gas at an idle, and chugs it when you need the power

control world populations, eat your young.

BeerBaron Sr.
06-28-2005, 05:00 PM
The Q-Jet is an Great Unit if its set-up properly,I have
rebuilt these for [drag]racing a well as off-road and general use for years,there is 2 sizes,[not rated in CFM],the bigger one generaly comes on trucks,Bigger Buicks and Olds,nothing is better than a Q-Jet that works,[on a resonable motor][iagree][iagree]

06-29-2005, 06:26 AM
I want to convert my q-jet to manual choke

I could have picket up a manual choke q-jet but opted instead for the heavy duty q, which only comes in the little heat spring activated type

control world populations, eat your young.

07-01-2005, 05:22 AM
ive got a holley on my 68 and its like u have to tune it once a month.. a loss of $325.oo buyin it but the quad works great on the 4x4 for me

my other toy has tits

07-04-2005, 02:15 PM
installed and tuned.
truck hasn't run this good since I got it 7 years ago.

what temp thermostats are you chev guys running. I've got a 195C thermostat in there now and it runs way to hot, thinking of throwing a 160C in and see how that goes.

control world populations, eat your young.

07-06-2005, 04:45 AM
I have always gone with a 180

Real Trucks are Built Not Bought
Life Begins when the Pavment Ends
"Four Wheel Drive is Like a Condom. Better to Have It and Not Need It, Than Need It and Not Have It."

BeerBaron Sr.
07-08-2005, 10:30 AM
:DLeave the auto choke on it,you'll have no problems with,these units very seldom require manual choking[unlike some others].
180thermo is good,but you should'nt go lower unless your in a
really hot climate[^]