It was a long time ago, soon after I got the car but I think it was as the manual says. I remember that just lining up the hole was not enough but  there should be some preload on the kickdown rod. I originally adjusted it because it was a bit sloppy, sounded like it was slipping under very light throttle, when almost coasting. I spoke to an old transmission guy who suggested I look at the kickdown first. That firmed up the shifts and the bonus of first gear when flouring it of the line.
Maybe catch up some day when this rain stops and I'll take you for a spin.

How did you adjust it Ian , did you still line up the hole in the bell crank etc ? I have adjusted the threaded rod [the one direct to the trans] but that had no effect on making it go into first, it does hold the gear slightly longer however it seems to "load up" and clunk into first when nearly stoped.
I did find the linkage I made for the Edelbrock works better and if I floor it will kick to second. before I had to push it through the floor to have any chance.



"Came too close to dying to stop living now!"

HI Rob.
My Tbird will go to first of the line if I floor it, since I adjusted the kickdown.

Frank/Rebop

Bristol, In ( by Elkhart) 

According to Holley tech, the 570 is geared more  toward stock engines.  It is the 670 and bigger which are for modified engines and bigger cams.

What I have is the 570, which Holley would not have suggested for my combo, had I asked before buying, and my engine is not at all radical.  I have acquired a 670 that I wil try soon.  So, if your engine is stock or a basic rebuild, 570.  If it is modified and you've gone up a couple steps or more on the cam from, say,  the standard 1957 cam, 670 or bigger.  And you can always call or email them and ask.



Lawrenceville, GA

To add to what Charlie has mentioned, the Holley Street Avenger series of carburetors are calibrated for more aggressive camshafts.  Because many of the ‘larger’ camshafts have a reduced carburetor signal at idle, the emulsion holes and air bleeds are sized differently to obtain the correct fuel mixture in the lower rpm ranges.  Many of the universal carbs have fixed emulsion and air bleed holes and are difficult to modify appropriately.  The Street Avenger carbs while still having fixed sizes, are sized for more aggressive camshafts and work better out of the box with modified engines.

Lorena, Texas (South of Waco)

Mostly, simply because it is a modern carb, it has modern fuel circuits.  The other features, I think you can retrofit to older carbs, but older and old style do not come with them.  Those are things like center hung float bowls, dual inlet, quick change secondary spring housing, secondary metering block.  Some of them are available with 4 corner idle.  For more info, check Holley's site.

Just for clarity, I'm talking about the lower end Holley carbs.  I know there are older high end carbs that do come with many of the same features as the Street Avenger.



Lawrenceville, GA

2721955 Meteor. I think I understand what you saying , but just cant see it working as you have to manually put it in first gear ? I ve never heard of this  - anyone else? .. If you can find the article by all means put it up so we can see..

Dry Lakes.. The Holleys have been on for a few years each the Edelbrock is only just recent. Fuel economy; the Holleys were the same to me, don't ask me to quote mpg I'd have no idea. I think I would expect slightly better from the Edelbrock by going on the vacuum gauge, time will tell.
Yes, I would have thought the smaller Holley would have been best that's why I had it made up for me.. It is a 450  list 4548  - 0509. Not part of the off road - marine set, well as far as I know unless Phil changed the breathers etc .. I would have thought they might have centre hung bowls too..I don't know?  I'd like to try one of the 500 Eddies, but of course I don't have one under my bench ; )

Charlie what has the Avenger series got that the old ones don't?







"Came too close to dying to stop living now!"

I tend to agree with Vic. Also found the Edelbrock extremely easy to understand and tune using the Edelbrock tuning book and their kits. I run one on the Red F code and it has been bulletproof so far. 1405 600cfm. 

Frank/Rebop

Bristol, In ( by Elkhart) 

I have an Edelbrock 600 (don't remember the number but manual choke) on my 312 powered 54 and it ran good straight out of the box.  Had the same thing with another Edelbrock 600 on my mildly modified 302 in my 48 Ford (electric choke) which has been on the car about 15 years without an overhaul. I checked the plugs over the winter and they were great, nice tan color. 

On the 48, I had a couple of Holley's (both new) and it seems that I couldn't keep either one in tune.  That's when I went to an Edelbrock.  Never had a hesitation or flat spot with the Edelbrocks.

I usually don't keep track of mileage.

The funny thing is that I have 56 Bird, 312 with a Holley 4000.  This carb runs very good and I got 14MPG on a cross country trip (3.37's no overdrive 65 -70 MPH).  The only Holley that hasn't given me trouble.


54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ