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holley 570 on a 360?
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davidotye View Drop Down
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    Posted: May/12/2012 at 7:41am
Hi all. I'll start by saying this is my first post here; however, I've used the forum several times beforehand. I picked up my first AMC/Jeep ever about 5 months ago in the form of a 1983 Wagoneer with an AMC 360. The motor is strong, just has tons of small issues that I'm slowly plugging away at. So, on to my actual question...
 
I'm currently running a Holley Street Avenger 570 cfm i picked up for cheap. I know it falls within Holley's reccommendations as a suitable carb for the 360, but it feels a bit restrictive. I intend to do some actual tuning to the carb along with a rebuild, but before I drop the cash on the parts I was considering finding a bigger carb first. Has anyone run a 570 on a 360 successfully? Thanks in advance
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nda racer View Drop Down
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Originally posted by davidotye davidotye wrote:

I'm currently running a Holley Street Avenger 570 cfm i picked up for cheap. I know it falls within Holley's reccommendations as a suitable carb for the 360, but it feels a bit restrictive.
 
That's cause it is. You can't compare the cfm ratings of Holley Avengers and HPs to the regular old Holleys. That's more like a 470-500 cfm carb. The old 1850 600 vac is much bigger than the 570. That 570 would be a good carb for a small 6 cylinder.
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FuzzFace2 View Drop Down
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I do think it is a little small but not real bad but would not go over a 650.
On my street 360 it has an old Holley 600 vac that I think will work out fine but being the car is a stick and if it does not work out will go with a Holley 650 DP.
My junk yard drag 360 (not more than a good street motor) I am running a Holley HP750 DP but had a HP650 DP that felt better off the line but the times were the same so kept the HP750.
 
Seeing you have the 570 I would "play" with it and see what you end up with till a 600 or 650 comes your way. Other than the gaskets parts should inter-change like squirters, jets, vac springs, power valves & accel pump cams so what ever you spend on that stuff (other than jets IIRC the other parts come it rebuild kits) you have not lost any money. Besides you get to learn how that carb works, what changes do what so if you do get another carb you will know how to tune it.
 
BTW the street car 600 vac carb I rebuilt 2 times and could not get it to run right so I bought one off ebay for like $150 was used on a plow truck 1 winter and pulled. I did pull in apart to make sure it was clean inside before I installed it and it works great, at least in the drive way.
Dave ----
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70 Javelin SST 390/4sp (360/5sp now)

70 Javelin 1/4 Drag car 360/auto
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Sonic Silver View Drop Down
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As long as your engine is near stock, and you are not expecting a big power rush after 5000 RPM, I think it will be fine. It should actually be more responsive in normal driving. Now, if you had a lightweight car with a cam and high performance intake and exhaust, that you were trying to max out at the dragstrip, I would say buy a bigger carb.
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nda racer View Drop Down
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It's funny how on my stock Chevy 350 a 650DP is more responsive down low and across the board than a 600 Eddy, Holly 600 Vac and Holley 600 DP. All those 600s feel flat in comparison and get no better mileage. You'd figure a better breathing AMC would want more.
 
I have a 600 Holley on my stock high mile 304 and it's too small. A 600 DP ran faster than the 600 vac on it. I was gonna try my 650 DP, but I just put the 1850 600 back on, cause I like the fuel line routing and it's just s cruiser anyways.


Edited by nda racer - May/12/2012 at 1:13pm
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davidotye View Drop Down
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Originally posted by nda racer nda racer wrote:

You can't compare the cfm ratings of Holley Avengers and HPs to the regular old Holleys.
 
Why is that?
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davidotye View Drop Down
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thanks for all the responses..at least for now i'm gonna run what i've got...till i find a bigger one for cheap. i dont really want to drop the cash on a rebuild kit for this one, so here's the issue with this one:
 
my main problem is a hesitation when i go from idle or cruise to WOT...then bogging once the secondaries open up. i havent tried much tuning yet, but i have tried all the springs and the bogging is kept to a minimum with the long yellow spring. the stock accelerator nozzle is .35; i had a .37 lying around so i put that on and went up two sizes on the secondary jets with no effect.
 
any suggestions are appreciated!
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Sonic Silver View Drop Down
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Originally posted by davidotye davidotye wrote:

thanks for all the responses..at least for now i'm gonna run what i've got...till i find a bigger one for cheap. i dont really want to drop the cash on a rebuild kit for this one, so here's the issue with this one:
 
my main problem is a hesitation when i go from idle or cruise to WOT...then bogging once the secondaries open up. i havent tried much tuning yet, but i have tried all the springs and the bogging is kept to a minimum with the long yellow spring. the stock accelerator nozzle is .35; i had a .37 lying around so i put that on and went up two sizes on the secondary jets with no effect.
 
any suggestions are appreciated!
The yellow spring opens  the secondaries at a lower RPM than the silver and black springs that are included. The stock accelerator pump nozzle should be a .031 , instead of a .035, unless Holley has changed it. The .031 would give a lesser shot for a longer duration, as opposed to the .035 or.037, which gives a bigger shot for a shorter period. Have you tried moving the accelerator pump cam screw from  position one to two, or vice versa? I believe that the stock pump cam is orange. 
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davidotye View Drop Down
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Originally posted by Sonic Silver Sonic Silver wrote:

] The yellow spring opens  the secondaries at a lower RPM than the silver and black springs that are included. The stock accelerator pump nozzle should be a .031 , instead of a .035, unless Holley has changed it. The .031 would give a lesser shot for a longer duration, as opposed to the .035 or.037, which gives a bigger shot for a shorter period. Have you tried moving the accelerator pump cam screw from  position one to two, or vice versa? I believe that the stock pump cam is orange. 
 
i have the entire spring kit...i went through them all and the long yellow one is the one that works the best as it is right now.
 
i misspoke, it did have a .031 originally.
 
it does have the orange cam; i did not try switching the screw position yet. Isnt the 2nd position for a smaller/longer shot?
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tsanchez View Drop Down
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What jetting?


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