Is anyone running the Truck avenger I was just wondering is it as good as all the ads say it is? :confused:

My girlfriends stepdad got one for his older dodge power wagon. It has the smaller dodge v8 (maybe 318?? forget ). Anyways, he had quite a few problems with it working properly. He went back and forth with holley trying to fix it and along the way they admitted they had problems with it working well on smaller displacement motors. Depending on what size motor you have it may work fine. They ended up sending him the street avenger and it runs good with that. It just doesn't have the sidehill capability as good as the truck avenger is supposed to have.

I have one on my 85 blazer (350, 4", 35's, 3/4 axel, 4.11's).
I love mine, after getting it set up it works fine.
side hill, up down the thing just keeps on going.
You will need to do some tweeking.

I love mine, but have had to do some tweaking on it as well. I'm currently running 2 filters to help keep the needle seats cleaner longer. I agree with cat_fish, you can show it whatever angle you want and the sucker just runs!

:evil: SETHZILLA!

I had one of the first ones and they had some problems getting fuel from the secondaries. After a visit with their tech department they gave me a new one right away. This one works much better. I am running it on a SB350 with a performer intake and a comp cam truck cam. It will run at almost any angle. Its prety impresive for a carb.

I'd suggest saving a few bucks and just picking up a quadra jet. Cheaper and will work just as good if not better.
just my $.02

i just bought one,...i'm having trouble /w it flooding i'm running a 383 sbc and the 770 cfm t-avnger any exp. w/ that? maybe jets too big? spring too soft?

I have one which is on my 318 engine in my 81 Ramcharger and as was mentioned earlier in this thread it has several problems, the worst being flooding. It also stumbles bad off the line. I too heard straight from the tech guys at Holley that the carb, in my case the 670 cfm unit would not work well on small displacement V8's like my 318. We have since changed out the accelerator discharge nozzle, the jets and now I am waiting on a different accelerator pump cam which is supposed to cure the problem, will keep you posted.

I have one which is on my 318 engine in my 81 Ramcharger and as was mentioned earlier in this thread it has several problems, the worst being flooding. It also stumbles bad off the line. I too heard straight from the tech guys at Holley that the carb, in my case the 670 cfm unit would not work well on small displacement V8's like my 318. We have since changed out the accelerator discharge nozzle, the jets and now I am waiting on a different accelerator pump cam which is supposed to cure the problem, will keep you posted.

Cool, I'd really like to hear about it when you get it back together. I've just mounted one on my 305, but have yet to run it (and really wanting to tune it first). I'm pritty sure that whatever you've done to your'se I will need to do to mine). I was also told that I would need to jet the carb down a lot for the smaller displacement, what jets are you currently running in it?

I had to jet down 2 sizes below what it came with from the factory to
# 122-65 this helped the drivability but not the stumble, the new accelerater cam is supposed to stop the stumble. That part should be in this week so I will report on the outcome. I have heard many owners say this carb works great and know one guy who runs a 770 cfm on a chevy 350 and have seen it in action and never seen him flood out or lean out, so it is just a matter of hitting that just right tuning. It is getting better with each mod. I have a propane conversion kit in my mind for the near future though.
Mark

I to was planning on getting one for my 350. Don't know what cfm I need though :confused: . Its stock as hell and I don't plan on doin any mods other than getting it running. Will the 470 cfm be to small or should I go with the 670 cfm. I don't want a huge gas drinker, but I want whats best. Thanks

I to was planning on getting one for my 350. Don't know what cfm I need though :confused: . Its stock as hell and I don't plan on doin any mods other than getting it running. Will the 470 cfm be to small or should I go with the 670 cfm. I don't want a huge gas drinker, but I want whats best. Thanks

As far as I know they only make it in a 770 and a 670 CFM versions

I to was planning on getting one for my 350. Don't know what cfm I need though . Its stock as hell and I don't plan on doin any mods other than getting it running. Will the 470 cfm be to small or should I go with the 670 cfm. I don't want a huge gas drinker, but I want whats best. Thanks

as i'm sure most of you are aware, the cfm of a carb only refers to the cubic feet per minute of air that a carb will allow into the engine. nothing to do with the fuel. you just need to figure out how much air your engine can take in at rated speed and that is the cfm carb you need for your engine. a carb that is a higher cfm than your engine can take in is just a waste of money because you may be able to get the same amount of power in a lower cfm carb.

i just bought one,...i'm having trouble /w it flooding i'm running a 383 sbc and the 770 cfm t-avnger any exp. w/ that? maybe jets too big? spring too soft?\

You are going to have a real hard time getting that 770 to run well at low RPM's on a 383. Its way to much carb for it. I think the problem is because of the new design that works better off camber, doesn't like to work at low flow rates. Its eather not siphoning or not atomizing the fuel correctly at low flow rates. So with a small cubic inch motor at low RPM's you can get a lean condition nomater what jets you have in it. The 670 is almost to much carb for the cammed SB350 I am running. If I let it load up at low RPM's (under 1000rpm) for to long (aprox 10 seconds) my O2 sensor starts reeding leaner and leaner until it backfires. If I ever want to lug the engine I have to pump the accelerator pedal to ritchen it up using the accelerator pump. But the carb works realy well when I open it up at higher RPM's! You are going to be much happier with a 670 CFM carb on that 383 motor.

I to was planning on getting one for my 350. Don't know what cfm I need though :confused: . Its stock as hell and I don't plan on doin any mods other than getting it running. Will the 470 cfm be to small or should I go with the 670 cfm. I don't want a huge gas drinker, but I want whats best. Thanks

Grab the 670. Even a stock 350 will need more than what the 470 carb can give you. You may have to jet down one size though. I'm picking up the 670 Truck avenger for my slightly modified 350 here soon.

As far as I know they only make it in a 770 and a 670 CFM versions

They just came out with a 470 version for smaller V-8's and 6 cyl's.

I want to put one on my 427 tall deck will the 670 be the better one?

I want to put one on my 427 tall deck will the 670 be the better one?
Tough choice. Depends how built the 427 is. If it's mild, I'd stick with the 670. If it's pretty radical, bump up to the 770. You may have to jet down with the 770 though.

It's a Tall deck Motor built for large trucks (mine came out of a C70) low hp

It's a Tall deck Motor built for large trucks (mine came out of a C70) low hp

I'd stick with the 670 then.

\

You are going to have a real hard time getting that 770 to run well at low RPM's on a 383. Its way to much carb for it. I think the problem is because of the new design that works better off camber, doesn't like to work at low flow rates. Its eather not siphoning or not atomizing the fuel correctly at low flow rates. So with a small cubic inch motor at low RPM's you can get a lean condition nomater what jets you have in it. The 670 is almost to much carb for the cammed SB350 I am running. If I let it load up at low RPM's (under 1000rpm) for to long (aprox 10 seconds) my O2 sensor starts reeding leaner and leaner until it backfires. If I ever want to lug the engine I have to pump the accelerator pedal to ritchen it up using the accelerator pump. But the carb works realy well when I open it up at higher RPM's! You are going to be much happier with a 670 CFM carb on that 383 motor.

well.....i played with the stupid thing some more and it just keeps fouling out my plugs i am not a holley guy the only other holley ive had was a pos on my boat. can i make it work though?....i bought the 770 'cause i was gonna use nitros @ the mud races and wanted the extra airflow ability if i cant make it work then its back to fuel injection..... any one want my 770 for thier bb? brand new not more then a month old and big fat 0 miles

Umm...sorry to tell you this but you don't need a bigger carb for nitros because the extra air (oxygen) comes from the nitros unless you are running your RPM's higher on the nos than naturaly asperated and need the extra flow. Most people are limited by their valve train on rpm anyway.

AS I promised earlier here is the report after changing the accelerator pump cam on my 670 cfm. The hesitation is almost gone now so this was a huge improvement because before this change you could not give it throttle under a load without the engine going dead. Hope this helps out.

how do i get people to look at my thred

how do i get people to look at my thred

You can start by not posting newbie tech in an extreme rockcrawling forum :rolleyes: There is a newbie forum or go over to a place like CK5 and post there...your lucky people arn't flaming the hell out of your thread :flipoff2:

hey Oldgoat,
What is the part # for the new acclerator pump cam you installed? I'm gonna need to get the same part for mine. Thanks,

:evil: SETHZILLA!

Can't find it right now but I got a formula out of an old Hot Rod mag.that calcullates carb size on cid, max rpm and maybe something else I'll keep looking any way a 350 running@ 5000 needs a 640 cfm carb

[QUOTE=sethzilla]hey Oldgoat,
What is the part # for the new acclerator pump cam you installed? I'm gonna need to get the same part for mine. Thanks,

QUOTE]


Same here...really want that part number. My carb has the same issues off the line. Also did the accelerator discharge nozzle really make that much of a difference? If so could I get the part number for that also. This would save me from having to sit on the tech lines with Holley countless times (and long distance charges).

Which one, 670/770, would be better for my 400 in my Toyota? I currently have an Edelbrock Performer 600 on there making good power, ~450, it just can't handle the steep angles unless for a short period of time.

Some have told me to just go with the 670, but 400x7000/3456 = 810 for maximum efficiency. The motor has been machined and balanced, I'm just not sure how much more the flow for the 770 would help me.

TIA.

Is anyone running the Truck avenger I was just wondering is it as good as all the ads say it is? :confused:

thats the exact reason they came out with that 470cfm

I will get that part # today and post it this evening, sorry it took so long for me to reply, been working a lot, which is a good thing!

Here are the part #'s in use on my Truck Avenger and it is running well right now with these but, with each engine being a little different you may have to tune some. This did get it from being a stumbling mess to running very smooth. I do detect a slightly rich condition on startup, maybe i will adjust the choke settings but so far as running it is fine now, good luck and again I am sorry it took so long to get the answer to you.

Holley Acc. pump cam Yellow P/N 20-81
Holley Acc. pump nozzle 121-137 please note the last 2 digits of this number denote the nozzle size so mine in this case is an .037 and if you ordered part # 121-135 it would be .035 and so on.
To answer the question about "did the acc pump nozzle make a real difference"? In my case it really did not. Of course the pump cam change did the trick.
Holley Acc. pump tuner kit P/N 36-184 this kit has all the above parts plus extras but is a lot more expensive.
Hope this helps.

Thanks Oldgoat, i'm gonna go order the big parts kit for mine today.

:evil: SETHZILLA!

Which one, 670/770, would be better for my 400 in my Toyota? I currently have an Edelbrock Performer 600 on there making good power, ~450, it just can't handle the steep angles unless for a short period of time.

Some have told me to just go with the 670, but 400x7000/3456 = 810 for maximum efficiency. The motor has been machined and balanced, I'm just not sure how much more the flow for the 770 would help me.

TIA.


I have 770, too big for mine....brand new...never got it to run right i went back to my Q-jet

You guys are leaving a critacle part out of the formula:
It is:
cid x rpm x ve / 3456
400x7000x0.93/3456 = 753.47
not:
400*7000/3456= 810
volumetric effency for a stock engine is approx. 83% and as high as 95% in a race engine and up to 115% in a blown engine.

Well, I did the first formula and came up with around 660cfm. Sounds about right. I just ran the formula with the "ve" included and came up with 426cfm. That sounds a little low. I'm running a 355, 5000 max rpm, 0.83 ve / 3456 = 426. Something doesn't sound right.

Now you know why most people over carb their engines. Most engines require less than people think.I have a HiPo 396cid v8, and I am useing a 670 TA.
I have the Edel Performer RPM power package, includeing heads. the cam is 232/232 @0.050. 1-3/4" primaries, 3" collectors and 3" dual exhaust.
It makes over 400hp and tq.
396*5800*0.92/3456= 611
This is the actual cfm of the engine at that rpm.
Too find the right size carb you need to times the cfm by 10-25%. 10% is for a stock engine and 25% is for a high end race engine like a Dragster.
So....
611 * 15% = 702
Thoereticly My engine will be down a little top end HP but the overall performance for my app will be best with the 670 TA.
Displacement is not the way to pick a carb.This is a 302 dragster:
302*7500*1.15/3456 = 753.68
753.68 * 1.25 = 942.11
So a 396cid may require 702cfm for best peformance while a 302 may need 942cfm for best performance.

I've got the 470 on the old 305 in my K5. Pretty stock, just different heads and an Edelbrock intake. So far it runs great. I'm getting ready to do a mild 350 build and I am going to see how the 470 handles it.

Even on a mild 350 - 470cfm is more than adequate unless you run the thing above 4 grand for extended periods of time. The throttle response and part throttle operation will be much better with the smaller carb as well. Heck, lots of circle track guys run 500cfm 2bbl carbs on their race cars.

That said - if you're spinning some race motor up to 9 grand at full throttle and leaving off the transbrake, You need the bigger carb and you suck up the crappy low end and part throttle performance. Then again, if you're spinning your motor at 9 grand, the cam dosen't make power below 3500 RPM... heck, you're lucky if it can idle at 1500.

The needed airflow of a given size engine increases on a curve as the rpm's increase... the faster you spin it, the more air (cfm) it needs to make power. It'll actually make more power down low with a carb that's not too big.

Well, I already bought my 670cfm Truck Avenger so I'm going to see how it works. The 470 carb just seems to small. If anything, I would rather have the larger carb and just jet it down.

Here are the part #'s in use on my Truck Avenger and it is running well right now with these but, with each engine being a little different you may have to tune some. This did get it from being a stumbling mess to running very smooth. I do detect a slightly rich condition on startup, maybe i will adjust the choke settings but so far as running it is fine now, good luck and again I am sorry it took so long to get the answer to you.

Holley Acc. pump cam Yellow P/N 20-81
Holley Acc. pump nozzle 121-137 please note the last 2 digits of this number denote the nozzle size so mine in this case is an .037 and if you ordered part # 121-135 it would be .035 and so on.
To answer the question about "did the acc pump nozzle make a real difference"? In my case it really did not. Of course the pump cam change did the trick.
Holley Acc. pump tuner kit P/N 36-184 this kit has all the above parts plus extras but is a lot more expensive.
Hope this helps.
what size jets ya running? I've got some problems with my 470 on #57 jets in the primaries, it said in the instructions that it came with #54, but upon disassembling it I found 57's. it is missing and sputtering at anything above 1500 RPM's on a very mild AMC 360. It doesn't read lean on the plugs, but it almost acts like it's running out of gas after it hits third gear. The float level is correct and the passages are all clean. I'm looking to find a correct baseline to start my tuning, but with the discrepency between the instructions and what's there, I'd like to hear what someone elses has before I change anything else!

okay, flame me, I re-read and saw that you are running a mid 60's jet, so do you think a 57 is too small for a 470? on paper it should be okay but now I'm not so sure!

thanks for the info old goat,

hope i can get mine running right soon

okay, flame me, I re-read and saw that you are running a mid 60's jet, so do you think a 57 is too small for a 470? on paper it should be okay but now I'm not so sure!

I personally think the 470 carb is too small for that 360 engine. No matter how large you jet it. I had a 2 barrel, 500cfm Holley on my stock 360 and it ran tits for years. I could tell that I was still starving the engine for gas though. The 670cfm seems a good choice for cubes in the 350-383 range.

I have a 670 on my zz4...

At first I liked the carb, even after re-jetting and tuning...
But after using it for hard core wheeling, I wish I just built a quadrajunk.

Everytime I hit a steep, rough obsticle, when my rig starts to bounce,
the carb will load-up the motor. I run with a buddy with the same carb,
he has the same issues. We have to put the pedal to the floor to keep the rigs running.

Save your money for propane or fuel injection.

I'd suggest saving a few bucks and just picking up a quadra jet. Cheaper and will work just as good if not better.
just my $.02
im in the boat with this guy... i would just stick with a q jet...

I personally think the 470 carb is too small for that 360 engine. No matter how large you jet it. I had a 2 barrel, 500cfm Holley on my stock 360 and it ran tits for years. I could tell that I was still starving the engine for gas though. The 670cfm seems a good choice for cubes in the 350-383 range.
I built my Jeep for 4000 rpm and under, slow speed rock crawling where the throttle response from the smaller CFM carb is needed. Most folks over carb engines anyhow, so I figured I'd go with a 470 to see how it does. I went down to 54 jets and it has gotten better, but I still have a rich miss at steady throttle 2500 rpm to 3500 rpm. I'm gonna drop to a 52 jet next, and a yellow accelerator pump cam and see where that gets me. Less CFM=lower jet numbers for proper mixture. I also have a 600 holley I use, and it has 65 jets in it, and it runs very nicely on road in the wagoneer, but it doesn't like angles and bumps off road.