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Old 02-16-2017, 10:16 PM
Gremlinsteve Gremlinsteve is offline
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Default Rochester carb issue

I have a Holley carb currently on my el camino that a previous owner installed
I am researching a few things about the Rochester carbs and since the original is long gone I would need to purchase items that will facilitate
A return to the e4me Rochester style carb

I currently have purchased an egay special Rochester carb along with the mounting bolts
I'm looking at the fuel line hookup side to this new carb and believe I have to order a 1 inch by 20 inlet fitting. The gasket and then that would allow me to run a barbed 3/8 fitting so I could hookup my rubber line

Is this correct?

Also. The carb fitting Does that have a fuel filter inside of it. Or would it be better for me to run an inline filter

If some one could snap a pic of a set up like this or give me a good part number list I would be grateful. I just wanna get this right the first time
Also
The carb has vacuum fittings on it
Wich one is timed so I can hookup the distributor and is there a fitting I need for the rear most vacuum port that will allow me to plug my rubber hose onto or will I need a barbed fitting for that also
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Old 02-17-2017, 06:15 AM
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welcome Steve

post up the carb number, or
you can put the carb number [on the driver side] in here and it will give you a parts list..
http://www.carburetion.com/CarbNumbe...umber=17085226
there was different size inlet fittings on different years..

you can run a short barbed fitting or get a 3/8" male flared steel brake line any length you want..

most all the stock inlet fittings have a filter/spring inside, but they are a pita to get to and change
on the car, a inline filter is much easyer to change,
and you don't risk damaging the inlet threads if you have to change it a lot..
I would leave the inlet filter in there also, with a 10 micron metal inline filter in the hose/tube..

if you are going back to the E4ME electric feed back carb with the computer,
you wont have a vacuum advance on the distributor, it will be the computer controlled version..
on a 87 the computer wont work right, unless both are the computer control versions..

any idea on how much of the other emissions stuff are you missing??
put some pics in your Garage, and we'll try and help..

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Old 02-17-2017, 09:46 AM
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Unless the carb is in really good condition I would also recommend putting in a in line filter.
These 35 + year old pot metal carbs are fragile and screwing and unscrewing the filter well cap just grinds off more of the thread out of the pot metal. So I would opt out of messing with it any more than you have to.
Also when installing it be gental tightening it on to the manifold.
Make sure to use a fresh base plate gasket.
Great carb just remember your working with old brittle crumbly pot metal.
No you can't have mine it's perfect.
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Old 02-17-2017, 09:47 AM
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Old 02-17-2017, 11:07 AM
steelybill steelybill is offline
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X2 on NOT using the inlet filter in the carb.! An external filter between the pump & carb is recommended.

Is the computer and wiring harness intact ? Since you went back to the EM4 type carb, you will need the computer, and a computer type distributor with electronic advance....
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Old 02-17-2017, 12:44 PM
Gremlinsteve Gremlinsteve is offline
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Yes
All of the computer and wiring is still intact
It was just a simple carb swap

The original carb was tossed out though. So I'm left with nothing

All of the emissions equipment is intact also.

The car has a stumble I can't get rid of that I am attributing to the swap. I have ruled out the current Holley as the culprit.

It runs great. But at light throttle tip in the car stumbles.
I'll have all the parts here in my hands next week
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Old 02-17-2017, 12:46 PM
Gremlinsteve Gremlinsteve is offline
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I'll know then if the carb I bought uses the straight fuel inlet or the 90 degree one
Since its a mid 80s e4me carb with the tps
I'm assuming that it's inlet is 1x20

I'll wait until I have it before I buy the parts to hook up the fuel line
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Old 02-17-2017, 02:34 PM
Gremlinsteve Gremlinsteve is offline
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Am I going to have trouble finding a air filter to fit this carb
I believe if memory serves me right that it's a 5 inch neck
Or is it 5 1/8
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Old 02-17-2017, 11:00 PM
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where/what kind of carb?? number?? got a link??
was it a Mountain Man Qjet from Arkansas??

most all chevy Qjets have the 90* inlet, ether will work I think, the strait inlet may need a
short radius 90* fitting??

Quote:
The car has a stumble I can't get rid of that I am attributing to the swap. I have ruled out the current Holley as the culprit.
where is the timing at?? what kind of distributor do you have??
if its a vacuum advance dist, it probly wont work with the computer,
if not, then the computer timing advance is probly not working without the right carb..

most holley and qjets are the same, 5-1/8"
http://quadrajetparts.com/cleaner-ga...eter-p-85.html

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Old 02-25-2017, 02:43 PM
Gremlinsteve Gremlinsteve is offline
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Well
I love it when a plan comes together

The cars running like new again
No more stumble and coughing

The end likes having the tps sensor hooked up again I think

Lol
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