carb vacum question

59poncho · Poncho Master!

carb vacum question

carbuff2007 · Addicted!

Well the way I see it I guess u could plug the holes, do you have vaccum adavance for the distributor, if u don't plug them.

BOSSY · Addicted!

Yes you plug them except the one small port for your vacuum advance. You will have 2 small ports the one near manifold is full advance and the 1 a little higher is the 1 you want for timed vacuum.

59poncho · Poncho Master!

i did put an electronic dist. in and tossed the points. what do you mean by the one "near manifold" bossy? thx guys

carbuff2007 · Addicted!

Got a pic of the new distributor, I put a MSD distributor this winter on my 305 and I had to run a vaccum hose from the front of the carb to the distributor. Your trans is auto or standard?

BOSSY · Addicted!

What kind of carb did you put on? With the motor running pull off a plug on one small port and put your finger over it and see if it is pulling air. Then do the same with the next small port and do the same if it is not pulling air that is what you hook to dist. That is the timed vacuum port and the one that pulls air all the time is full vacuum or full advance on dist.

59poncho · Poncho Master!

its a delco remy dist. circa 1980 or so and its a 4-barrel quadrajet on a aluminum "defender" i think intake. I was trying to find out what carb it is and the # i found was 17086582 which i think is a M4MED carb.

The other problem im also haveing is when i put it in drive or reverse it stalls out. Now I think its because i need to fill up the tranny (small leak in the original cast-iron glide) that with the vacum not right might be the problem. ?

-- Edited by 59poncho on Friday 20th of May 2011 05:48:50 PM

Beaumont4008 · Uber Guru

Looks like thats a 86 carb. I thought they were computor controlled. Not sure how well the would work with out the computor hook ups. I do not even think you can set the air idle mixtures on that carb. With out the proper air idle setting it would stall out I would think.

-- Edited by Beaumont4008 on Friday 20th of May 2011 07:16:18 PM

59poncho · Poncho Master!

its not a computer one, i might have the #s wrong. I got it from GA on this site who had it on a 327 maybe, i cant remember. let me get the right #s and i'll chime back in

JC2+2 · Poncho Master!

If you got an HEI distributor from the 80's you should change the vacume advance pot. 80's engies used manifold vacume to the distributor. If you are going ported vacume to the distributor which you should, get a vacume advance pot from a 77 or 78 3/4T pickup. They used ported vacume. If you don't, the engine will most likely ping due to too many degrees total advance. The advance unit will have a number on it showing degrees. If it reads 20 or more, change it over.