Help car drops 700 rpm when going from neutral to first gear
 

New combination 406.

Car drops 700 rpm when going from neutral to first gear and will eventually die. It gets worse when the car is at operating temp. Ignition?

Please Help.

Re: Help car drops 700 rpm when going from neutral to first
 

Sounds a lot more like carburetor than ignition. Quickest way to find out is to swap another on it. Also, check the power valve(s) if so equipped.

Re: Help car drops 700 rpm when going from neutral to first
 

either lock out the distributor or recurve it so it has ~ 20 degrees initial and 16-18 degrees mechanical advance. Easy to do with an MSD distributor.

Re: Help car drops 700 rpm when going from neutral to first
 

Holley carb?

Re: Help car drops 700 rpm when going from neutral to first
 

Also very hard to start at operating temp!

Little M Block 14:1 cam @ 50 278 intake 290 exhaust 111 lobe separation AFR 210's 5800 stall 750 carb that flows 920.

Re: Help car drops 700 rpm when going from neutral to first
 

way too big cam and not enough stall but that's not your question.

Re: Help car drops 700 rpm when going from neutral to first
 

Distributor locked.

Re: Help car drops 700 rpm when going from neutral to first
 

Yes

Re: Help car drops 700 rpm when going from neutral to first
 

how's the carb setup/baselined...how/where are the floats set, same question for transfer slots? What is the idle set at? Also how much fuel pressure?

Re: Help car drops 700 rpm when going from neutral to first
 

Jet size 82 all the way around float level fine. transfer slot I don't know. how do I check?

Re: Help car drops 700 rpm when going from neutral to first
 

7 1/2 psi

Re: Help car drops 700 rpm when going from neutral to first
 

before you say the floats are fine do this...remove the bowls, invert them and slide a 3/8" or 7/16" drill bit along the roof of the bowl and the top of the float, adjust as necessary.

As to the transfer slots...take the carb off, turn it upside down and look at the slots that are in the wall of each bore. The baseline setting should be about .020 measured with a feller gauge and they should look like this [ ], partially covered by the throttle bore blade(s).

After checking/setting the floats and transfer slots, reinstall, set idle mixture screws, then set idle screw.

7 1/2 is to much, lower it to 6 1/2 for a baseline. If your fuel gauge is liquid filled, get rid of it.

Just confirming, you have no mechanical advance in your distributor?

Re: Help car drops 700 rpm when going from neutral to first
 

Distributor is locked.

Re: Help car drops 700 rpm when going from neutral to first
 

transfer slot(s)

http://i381.photobucket.com/albums/o...ps76e56c26.jpg

Re: Help car drops 700 rpm when going from neutral to first
 

Equalize your back transfer slots as so they are close to the front. In other words open up your year blades ,so you can close your front. You may even need to drill bypass holes in the blades.
Showing too much transfer slot can and likely will give you hard starting issues once the engine has had some heat in it.

Re: Help car drops 700 rpm when going from neutral to first
 

with his big cam and tight converter, i would bet he will need to drill the throttle blades if not already done.

Re: Help car drops 700 rpm when going from neutral to first
 

It would be the best starting point......... to drill the blades......

Re: Help car drops 700 rpm when going from neutral to first
 

it's best to setup the carb properly first. THEN if the problem is still there, drill the throttle blades and reset the idle mixture screws, followed by the idle screw.

Re: Help car drops 700 rpm when going from neutral to first
 

Throttle blades are drilled

Re: Help car drops 700 rpm when going from neutral to first
 

All four? How big are the holes? If the holes are too big they can create issues also

Re: Help car drops 700 rpm when going from neutral to first
 

get the carb off yet?

Re: Help car drops 700 rpm when going from neutral to first
 

Please Call Me 210 533 8058 Raul

Re: Help car drops 700 rpm when going from neutral to first
 

.165 bore have use this carburetor for years and have never had this problem.

Re: Help car drops 700 rpm when going from neutral to first
 

There is the key. What has been done/changed since the last time it ran properly? You stated this is a new combination...did you by any chance add/change any timing related or ignition components?

Re: Help car drops 700 rpm when going from neutral to first
 

Raul, making any headway?

Re: Help car drops 700 rpm when going from neutral to first
 

1320 Racer ... Please send me your number and I'll call you. thanks
Raul

Re: Help car drops 700 rpm when going from neutral to first
 

Just engine combo long block? Went from a 355 to a 406. Same Heads Intake and Carb for the last 15 years.

Re: Help car drops 700 rpm when going from neutral to first
 

My point was carb's don't just go bad/quit working overnight. Unless it has sit idle for a very long time with old fuel I would tend to look elsewhere first. Someone suggested earlier trying another carb for effect...way less time consuming and a quick way to eliminate one potential area.

Re: Help car drops 700 rpm when going from neutral to first
 

I`m sure you`ve already looked for vacuum leaks....

Re: Help car drops 700 rpm when going from neutral to first
 

I had the same issue with a 750dp on my wagon. It turned out to be the transfer slot on the secondary's. I bought an adjustable 1 to 1 linkage for the carb. While it look to be adjusted correctly on the bench but when I attached the quick disconnect linkage to the carb it pulled the secondary butterflies just enough to cover the transfer slot. I put the original bent metal part back on problem was corrected. Good luck.