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| Username | Post: 283 4bbl carb leakdown | |
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62chevy427 "7th Year" Silver Supporting Member Posts 1516 
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05-12-12 08:06 AM - Post#2225111
i am working on a 64 283 with the original 4bbl carb and 40k miles. i rebuild the carb and it runs super. the only problem,after it sits a couple of days, it is difficult to start. choke is adjusted and working. squirt a little gas in it andit starts right up. i need some ideas where to look for a gas leak. thanks
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Allan In NE Contributor Posts 921 |
05-12-12 08:26 AM - Post#2225120
I take the 'full' carb and set it on my vice. In about 10 minutes you can usually see where it is seeping. Either the lead plugs in the various channels or a porous body. Allan
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Allan In NE Contributor Posts 921 |
05-12-12 08:28 AM - Post#2225121
I take the 'full' carb and set it on my vice. In about 10 minutes you can usually see where it is seeping. Either a lead plug in one of the various channels, or a porous body. Allan
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Mad Joe Contributor Posts 392 
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05-12-12 09:10 AM - Post#2225130
Just going off memory since I haven't owned a late great in years, but I'm 99% sure Chevy did not use 4 barrel carbs on full size cars with 283 engines in '64. If you got a factory 4 bbl in your '64 Impala, it was attached to a 327 or 409. Many like myself changed their 283 to 4 bbl. Just setting the record straight. |
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del.impala Contributor Posts 349 |
05-12-12 09:27 AM - Post#2225136
In 1964 as an extra cost option they did have a 220hp 283 which was a 4Bbl carb,I believe was used with optional factory installed air conditioning. You might be experiencing carb drainback because with the fuel systems at that time operating at anywhere from 4 to 5 to almost 6 p s I, if it was not driven everyday the fuel pressure would relax and you would have to refill re pressurise a fuel system by turning it over a few moments. and of course you have fuel evaporation and the fuel now with ethanol which doesn't stick around in the fuel bowls like the old fuels used to. So long story short you may have to just turn it over for a few seconds each time you wanna drive it and then pump it. |
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Mad Joe Contributor Posts 392
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05-12-12 09:40 AM - Post#2225140
del: Are you sure that engine was available in an Impala? I thought that was possibly a Malibu engine. If you are correct, then it is different information than I had back in the mid 60s. My understanding was in '64 Impalas, no 283 came with a 4 bbl. Not wanting to argue, just trying to learn. btw, my factory air '64 came with a 2 bbl. |
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Mad Joe Contributor Posts 392
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05-12-12 09:49 AM - Post#2225150
Scroll down about 3/4 of the way and you will see the engin/carb combos. http://www.oldride.com/library/1964_chevrole t_impa... |
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motorman Super Senior Member Posts 5037 |
05-12-12 09:51 AM - Post#2225152
the way i check for main body leaks is remove the throttle body and set the main body on a clean sheet of white paper. add lacquer thinner to the float bowls and check to see if any thinner wet spots shows up on the paper
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62chevy427 "7th Year" Silver Supporting Member Posts 1516
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05-12-12 11:47 AM - Post#2225178
the engine is actually in a 55 chevy.
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Richard Martin Valued Contributor Posts 4411 |
05-12-12 11:53 AM - Post#2225179
del: Are you sure that engine was available in an Impala? I thought that was possibly a Malibu engine. If you are correct, then it is different information than I had back in the mid 60s. My understanding was in '64 Impalas, no 283 came with a 4 bbl. Not wanting to argue, just trying to learn. btw, my factory air '64 came with a 2 bbl. Your information is spot-on. The full-size '64 Chevrolet was not available with a 4-bbl carb 283. However the '64 Chevelle and '64 Chevy II/Nova were. 1964 big-Chevy standard and optional engines: http://www.oldcarbrochures.com/static/NA/Chevrolet... Richard |
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del.impala Contributor Posts 349 |
05-12-12 01:46 PM - Post#2225198
On this i will agree to disagree. In the late 70's i removed a 4bbl carb and intake from a 64 I believe four door impala.at the time they appeared OE to this car. I believe I can still get to the carb and intake for a check of numbers on intake and carb.stay tuned. |
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Richard Martin Valued Contributor Posts 4411 |
05-12-12 01:56 PM - Post#2225201
On this i will agree to disagree. In the late 70's i removed a 4bbl carb and intake from a 64 I believe four door impala.at the time they appeared OE to this car. I believe I can still get to the carb and intake for a check of numbers on intake and carb.stay tuned. Your choice and right to disagree but in my opinion you can't make a judgement call on someone's 10 year old used car. I make my decisions from actually selling new 1964 Chevrolets at my Uncle's dealership and ALL the 1964 Chevrolet printed information such as this: http://www.oldcarbrochures.com/static/NA/Chevrolet... The RPO for the 4bbl. carb 283 is L77 and it became available as an option on the 1965 full-size Chevy mid-year around the same time the 409 engines were dropped and the 396 engine was introduced. Richard |
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arnieg141 Dedicated Enthusiast Posts 6116 
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05-12-12 02:48 PM - Post#2225205
claus it's not the carb it's the new fuels we use after a car sites a few days evaporation in bowl.being there not electrick fuel pumps the bowl is not filled right away. just dont press on gas pedal turn over car a few times then again.now push pedal down to set chock and will start right up
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62chevy427 "7th Year" Silver Supporting Member Posts 1516
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05-12-12 04:29 PM - Post#2225228
thanks. i'll give that a shot. if necessry,we can install an electric pump. may even wire it so it only runs with the starter engaged.
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arnieg141 Dedicated Enthusiast Posts 6116
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05-12-12 05:25 PM - Post#2225248
no need realy for the elec.fuel pump. just hit the starter quick just enough to spin motor a little like 2 turns ! repete that -then push pedal to floor to set choke and start right up
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f.i.57chevynut Frequent Contributor Posts 1215 
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05-14-12 12:57 AM - Post#2225678
I have the same problem with all my 57's. The gas seems to evaporate and I have to crank the starter until the pump refills the carb. If I drive the car every day I don't have the problem.
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arnieg141 Dedicated Enthusiast Posts 6116
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05-14-12 04:15 AM - Post#2225695
tom found so many guy's rebuilding carbs and adjusting for nothing.we found it a long time ago in the 49 to 54 section.just the taping the starter let off and tap againg filled the bowl and start right up. just because of new fuel blends in these older cars. drived every one nuts that just takeing a car sitting a few days and starting like this solved 90% of the carb start problem 
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62chevy427 "7th Year" Silver Supporting Member Posts 1516
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05-15-12 07:23 PM - Post#2226330
i tried that. did not work. spun it in short spurts until the battery was almost dead. no gas. squirted a little in the carb and some in the bowl and it fired right up. bought a electric pump today. am going to install it with a toggle switch so it can be cut off if desired.
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arnieg141 Dedicated Enthusiast Posts 6116
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05-16-12 03:45 AM - Post#2226413
sorry did'nt work .good luck with the electick pump
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1963SBHD "3rd Year" Gold Supporting Member Posts 144 
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05-17-12 10:00 PM - Post#2227051
Had the same problem with mine, went through the carb with new gaskets, adjusted and snugged everything up and still had to spin over and pump. Changed to 100% unleaded and electric pump with a new demon carb and not a problem at all. Hooked a switch with a LED red and green for off and on and that is hooked to the key. Turn on the key, the red light comes on, flip the switch to green and verrrooom. Starts just fine. Also put some fuel stabilizer in just for insurance. Even though the 100% unleaded is harder to find, I use it when I can or premium unleaded, Amoco or Shell while traveling. When we travel with our car club we map out a route that gives us 100% unleaded gas all the way there and back. Good luck with yours...and run a filter on the gas line. |
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62chevy427 "7th Year" Silver Supporting Member Posts 1516
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05-18-12 08:17 PM - Post#2227382
seems like the way to go.not too much trouble to install and not too expensive,either. i usually only put a red or amber light to indicate the pump is on,but the red/green is a good idea. the pump i bought has a filter before the pump and i always run another in or near the carb.
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arnieg141 Dedicated Enthusiast Posts 6116
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05-21-12 07:19 AM - Post#2228159
how did you final fix problem
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