Does anybody out there know what series truck avenger carb i should run on my small block 350. I believe it is a 680 series but I would like a little more assurance on that. I believe my 350 has about 200 to 225 horsepower but PO put the motor in so I am not positive. Thanks
truck avenger
- Thread starter hystrymakr
- Start date
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hy,
go to the holley site...they have a place to contact them....they will give you all the info you need...i just finished figuring out what carb and intake manifold i need to purchase for the chevy 283 in my sons cruiser...they respond very quickly to all requests for information
osagecruiser
go to the holley site...they have a place to contact them....they will give you all the info you need...i just finished figuring out what carb and intake manifold i need to purchase for the chevy 283 in my sons cruiser...they respond very quickly to all requests for information
osagecruiser
just remember unless your building a high RPM race motor that smaller is better. i like between 500 to 650 CFM for the small block chevy. i think the avenger for the 350 is rated at 670 CFM and the factory quadrajet is about 780 CFM but with very small primary's and huge secondary's (spelling) good luck with it!
It's taken me some time to set up my 670 cfm Truck Avenger on my mild 350.
The carb is set up very rich to make it universal. If it won't run a vehicle out of the box, then you've got some serious problems not related to the carb. Gas mileage was bad.
I dropped the primary jets from 68 to 64. This brought the mileage up a bit, and the plugs look normal now (they were sooty black before). But it also caused an off idle stuble, so I increased the accelerator nozzle from .028 to .032. This solved that problem.
The secondaries are jetted extremely rich. I changed them from 89 to 79. That helped, and it may be possible to tweak that some more.
I did increase the power valve from 2.5 to 6.5. The vacuum gauge showed that I never even got to 2.5, even under WOT. Might as well have put a solid plug in there. And that's the point - you have to jet way up when you replace the power valve with a solid plug. Up to 8 to 12 jet sizes, depending on the carb size. So this went hand in hand with dropping the secondary jet size from 89 to 79.
I still haven't gotten the mileage to 10 mpg. The primaries may need to either be jetted up slightly, like to 76. And I might try out an 8.5 power valve.
If I had a blank slate to start with, I think I'd rather have the 470 cfm Truck Avenger. Being smaller, it should have better low end throttle response. And the flow velocity should be higher, which should mean better mixture.
Or, I'd rather get a rebuilt Rochester. Something for a 350 truck from the mid-70's ought to be close enough. The Rochester is not as easy to work on as the Holley, but they do seem to get better gas mileage.
The carb is set up very rich to make it universal. If it won't run a vehicle out of the box, then you've got some serious problems not related to the carb. Gas mileage was bad.
I dropped the primary jets from 68 to 64. This brought the mileage up a bit, and the plugs look normal now (they were sooty black before). But it also caused an off idle stuble, so I increased the accelerator nozzle from .028 to .032. This solved that problem.
The secondaries are jetted extremely rich. I changed them from 89 to 79. That helped, and it may be possible to tweak that some more.
I did increase the power valve from 2.5 to 6.5. The vacuum gauge showed that I never even got to 2.5, even under WOT. Might as well have put a solid plug in there. And that's the point - you have to jet way up when you replace the power valve with a solid plug. Up to 8 to 12 jet sizes, depending on the carb size. So this went hand in hand with dropping the secondary jet size from 89 to 79.
I still haven't gotten the mileage to 10 mpg. The primaries may need to either be jetted up slightly, like to 76. And I might try out an 8.5 power valve.
If I had a blank slate to start with, I think I'd rather have the 470 cfm Truck Avenger. Being smaller, it should have better low end throttle response. And the flow velocity should be higher, which should mean better mixture.
Or, I'd rather get a rebuilt Rochester. Something for a 350 truck from the mid-70's ought to be close enough. The Rochester is not as easy to work on as the Holley, but they do seem to get better gas mileage.
for the 283 holley recommended the 470 cfm truck avenger and thw weiand 8004 instake manifold....i currently have the stock 2 barrel so i also have to install a new manifold...
osagecruiser
osagecruiser
So far I like my Edelbrock AVS carb with spring loaded seats coupled to an Edelbrock performer intake. Although from other threads I have found most people prefer the Q-Jet carb...
Hey osage, I got an old edelbrock torker intake that needs to be cleaned up I can sell to ya cheap.
Hey osage, I got an old edelbrock torker intake that needs to be cleaned up I can sell to ya cheap.
how much do ya want for the intake manifold?...shipping to 66523...let me know...thanks
marc mcfarland
osagecruiser
marc mcfarland
osagecruiser
