The 2300 is the same carb I have on the Gremlin with a 304 motor and pretty sure it has the 50 cc pump to get rid of a off idle bog it had.
Right now the car is used as shelf so cant open the hood to check pump size and cant remember if I have it in my "Holley notes" in the Holley pit box or not.
Think my sons Jeep also has a 2300 on the 258 six so if I do have notes it might be for it too?

IIRCto run the 50cc pump the rubber, the cap with the 4 screws and the pivot arm are different than the 30cc pump.
I may have some 30cc parts in the pit box if you need them but I know I dont have any of the 50cc parts.
I also should have some gaskets too.
Dave ----

 

Ok I just changed the diaphragm, I don't know anything about them needing different arms. I figured it's made to accommodate 50, and then the 30 just has a smaller diaphragm and contains less gas.

I just googled it, and it seems you are right. So even though I have a 50cc diaphragm, my whole assembly is for 30cc so that's all I'm getting. It says the 2300 normally comes with a 30cc, so I am going to assume my 351 has that. But the one on my 289 I remember buying one that was polished and "performance ready" and I thought I remember reading that it had the larger accelerator pump in the description, but that has been 9 years ago so who can remember for sure.

So Holley 2300 is the basic model number, but the specific part numbers are 4412 for the 500 cfm and 7448 for the 350 cfm. That is what I put on the 302 in the Mazdaratti.

 

The 4 bolt covers for the 2 pumps are different besides the rubbers.
If you look at the 30cc rubber and cover it is not as deep as the 50cc rubber and cover.
Because of this the pivot arm that I think was frozen on yours is also different as the arm on the cover is now lower.

IIRC the 50cc kit was the deeper rubber, longer spring, deeper cover and the pivot arm held on by that "E" clip.
I never tried to mix and match any of the parts as it was a kit.
Also did not think you could and have the pump work right?
Could not put the 50cc rubber in the 30cc cover, would not fit.
Springs may swap?
Dont think the 30cc pivot would reach the 50cc cover arm to push it to pump?
Just from what I remember from when I last played with the pumps.

I am pretty sure I have everything for a 30cc pump from when I swapped to the 50cc and the 30cc rubber part comes with the rebuild kits.

Dave ----

 

Hard to tell but this is the 30cc kit
Dave ----

 

Well I have put a 30cc diaphram, and now a 50cc diaphram, into my same housing, and everything lined up so the rubber gasket shape is at least the same.
It was not the pivot arm on the accelerator pump that was frozen, it was the arm on the throttle link age that pushes it down. It rides against kind of an oval vs a circle, so that at no throttle it is on the round part, and then as throttle is pushed down it rides against the egg shape portion and pushes down. It was just frozen in the down position. And when I forced it to move, it was still frozen to the pin, just turning the whole thing (which scr3ws into the base of the carburetor).

Tom is on his way down today, so at some point in the next few days we will be tinkering with the 69 Dart race car. We have to drain the old pump gas out and put race gas in it. When it was sitting, Chuck told his son Brady to get gas for it and make sure to crank it up every so often. So Brady went and got pump gas instead of race gas. Too much compression for that, hard to start and won't run right. Tom had Wayne come over and write down all the part numbers off the carburetor, so the plan is to pull it off and go through it. Meanwhile there is a fuel pressure regulator that has gone bad (leaks) so I think either Tom or Wayne ordered a new one. I would say maybe we can go run it down the Dunn-Benson track, but those tires are old and dry rotted so that is probably not in the cards.

 

I knew what arm was frozen.
As long as you matched all the right parts up it should work, dose it squirt?

When you guys start on the Dart let me. Know I would like to hang out and give a hand if I can.

I got good news I can drive and back at work.
Up at 3am to work by 5am and unloading first of 3 cement loads by 730.
It's going to bea long hot day after a month not working.
Lucky i got my truck and cement trailer but cant find my LP trailer that had a lock on it in either yard?
Going to have to ask dispatch to track it down.
Dave. ----

 

It does squirt, in fact I have very good news. After 2 days of sitting without me touching it, I got in the truck, pressed the gas pedal down once, hit the key and it fired up. I don't think it's done that in 10 years so I am very pleased. Don't have to constantly pat the gas pedal to "git her goin'"

That is awesome news about your being able to go back to work. Except for the LP trailer walking off on it's on

Will send you a text when I know more, it seems Tom has 10 days worth of things planned for his 5 day visit, so nothing is really planned out yet.

 

Good to hear the carb fix worked.
Nothing worst then messing with something and all for nothing.

I did find the LP trailer after I was asked to do some LP loads Saturday.
I told dispatch I did not have a trailer and they said it was at the welder down the street.
They had to re-weld the bumper as it got bent when I got the truck & trailer stuck in mudd a few months back.
I also told them I had someone coming, a little fib, so could not work.

Got to love it 5 days to do 10 days of work LOL
Yea text me when you know more.
Dave ----