I had problems with factory holley 2818 carb. I got a holley 600 double pumper to replace. Throttle will not open all the way. I adjusted rod only causing other issues. Either way cant get pedal right? Any suggestions such as new rod or swivels? Engine is L79 350hp.

 

What air cleaner base you running

 

Nowhere Man may be on to something...

Holley 2818...


Holley "double-pumper"...


Notice that the "float adjustment" screws on the double-pumper are not only taller, but they are in a different location than the ones on the 2818. Typical Corvette drop-base air cleaners will not clear the float adjustment screws on a double-pumper without modifying them with a few well placed taps from a body hammer.

Is the base possibly interfering with the linkage, or are you unable to get full throw with the base off of the carb?

Good luck... GUSTO

 

And not being able to make the original carb work really questions my thoughts on the person working on it.

 

ItE=Nowhere Ma4040]And not being able to make the original carb work really questions my thoughts on the person working on it.[/QUOTE

I Am running stock air cleaner... i sent factory carb off to best builder in country to restore. Still leaks after milling base plate full resto, and new metering block. I can rebuild it with my eyes closed. Tired of messing with it for now. But i know what i am doing.. anyway i posted thread as i cant be first to have linkage issues..

 

Who is your best rebuilder?? Look on the underside of the air cleaner base and see if it's hitting

 

With linkage unhooked from carb do you have free travel?

Is the arm that comes out of firewall hitting the oil pressure line?

Does the carb open up without the butterflies hitting the manifold?

EDIT:

Also, when you look at the pics of the carbs provided, you'll notice that the location of the throttle linkage 'hookup' is clocked differently...I think your going to need a shorter 'rod/linkage'....

 

I have the same problem with a '66 L36 with either the original carb, or a replacement Holley. It idles too high when adjusted per service manual.
Accelerator lever is loose and or worn on pedal rod D shaft. It is a pain to get to.
Check for worn pedal shaft, loose or incorrect lever.
John

 

I fixed the air cleaner issue right away. Look at hole in carb linkage.. the double pumper linkage hole is higher. Causes problems. If you lengthen factory rod by adjustment then it pulls pedal too close to floor. Cant get adjusted perfectly due to angle now.

 

Nothing to do with air cleaner... cant get factory rod adjusted perfectly with double pumper, butterflies only go about 3/4. I checked with air cleaner off of course, cant even see with it on.

 

You are correct.. it is the LOCATION. So.. how do you fix? Shorter rod will make pedal linkage hit firewall. I think either new rod with swivels, or maybe even have to extend pedal linkage.. i was hoping someone could tell me.

 

I'm running a 600 dp on my '64 with a Corvette drop air cleaner and have no issues with the linkage. I get full throttle. Is a '65 different?

 

Check where the 'lever' attaches to Pedal lever on firewall....You should be able to loosen the nut/bolt and make up some adjustment there...plus you still might need a shorter rod or the original one 'might' make up the difference..

Loosen the nut and rotate towards carb, but be careful, it might hit the bell housing or the oil pressure line...the 'angle of Lever to carb' might also be off if you rotate it to far....

Its worth a try...

EDIT:

What manifold are you running???

 

Does your throttle arm on the carb have the second (smaller) hole below the main hole as shown in the (double-pumper) picture? If it does, how about drilling it large enough to fit the accelerator rod in it and try that? If it gives you enough leverage to get full throttle, then go back and modify it to accept a small nylon bushing similar (but smaller) to the main hole.

Most auto parts stores carry a small packet of nylon bushings for just this purpose in a variety of locations on cars designed to isolate and prevent metal to metal wear.

Good luck... GUSTO

Jack, unfortunately the interface between the "accelerator lever" and the "swivel rod" (pedal lever) is fixed (by the "D" shaped hole and corresponding flat on the swivel rod) and would likely only offer a few degrees of adjustment, if any.

 

'65 300Hp & 350 HP use a different "arm" coming off the pedal connection - is yours correct?

 

It is the same... I am beginning to believe that I may have some worn parts in pedal shaft, even though car has been restored.. I bet those parts were overlooked. Thanks for the info., I was wondering if anyone else had success with DP.

 

Not sure.. going to check all the linkage parts out now after this info. Thanks for your input!
Chris

 

A longer "accelerator lever" would give your accelerator rod some additional travel, but it will also raise the rod and may result in interference with the air cleaner. The Corvette used three length "accelerator levers". The longest being the '63 lever, with the '64/'65 being just slightly shorter and the '66/'67 being the shortest.

If you could measure the lengths and use a little geometry, you could determine if it is possible to get the additional travel you need. Page 50 of the Paragon catalog shows all four levers at the top of the page in one image and this may give you an idea if either the '63 or '64/'65 levers would be helpful.
https://www.paragoncorvette.com/corv...talog/c2/#50/z

Good luck... GUSTO

 

Thanks for all the input! I found that accelerator lever was getting some interference from oil line, so I moved that. Now I have some play in lever bushing, so I am ordering that. Hopefully that will fix it. It appears to be correct accelerator lever, as 300 hp is little taller. Thanks again for help! Wish I knew how to post pics on here?

 

Is the 2818 leaking form the base plate or other places. When does it leak, after hot shut down?? There are two other holes in the factory base plate that don't use screws and I believe the aftermarket Holleys use these holes. You wilkl need to tap the main body to use them but that may help.

Did the main body get milled, front back and bottom.