Camaro-3

Hi,
I have a used 305 engine that did'nt run since 2 years, with the 4 barrel rochester carb on. I ordered an AC delco rebuild kit to make sure the carb will be in good shape.
But I have another spare carb and I hesitates between... Which one will be the best base for a carb rebuild?

1. The original carb of my engine, which have 30 years old running, not runned since 2 years, probably runned daily between 1984 and 2015, so maybe 100 or 120k miles or more.

2. A carb from a 305 of similar year too, but It's a spare carb my father have (buyed used when he had a camaro 30 years ago) and stored since 30 years on a garage which was not heated. When I check the outside, this carb seems a lot cleaner than the carb of my original engine, and It haves probably runned less than 30k miles, but it was not running since 30 years and it may be exposed to a lot of moisture over years.

Which one is the best choice to use for a carb rebuild?
One exposed to moisture but a lot less miles or the one that runned almost every year but maybe more than 100k miles?

NoEmissions84TA

iTrader: (1)

You did not say what years.
Yours is most likely electronic - an E4ME.
Your father's is most likely manual - an M4ME.

My vote is to have yours rebuilt.

Camaro-3

The two carbs are not electronic, but i dont know the exact year for each carb, since it's probably not the original engine of the 84 camaro too. The carbs are from Canada 305, i think these are not electronic. My question is most about the problems that High mileage carb could have and that is not possible to completely solve with a rebuild VS a carb stayed un a shelf for 30 years old could have (like oxydation... But the carb is almost like new, it's almost the same as a part from a 2014 car because carb has never be used since 1987-1988. All gaskets and rubbers are worn but rebuild will solve that, but maybe the throttle have less loose if it have less mileage. On the other hand, i'm wondering if some parts could be jammed because it stay on a shelf too long...

zed-028

shaft play is the only thing to worry about but youll only get an idea of how bad it is once you disassemble it.

once you have it in pieces, give it a good soaking in carb cleaner and metal rescue. That will clean out the slots where the throttle plates go into.

There are a few videos in internet lan that show you how to teflon tape the rod ends of the throttle blades if there is excessive wear. I've rebuild some high mileage, and 40 year old quads and never come across one yet that needed this process.

a few little things like retrofitting the seals for ethanol and stuff. But for the most part these quads are pretty much bulletproof and the carb itself can last for much longer than the life of the car itself.

i would pull both apart - compare the play in the shafts, put a full rebuild through the one you choose complete with eth seals on the throttle pump etc, check/replace the jetting if need be, put it back together, vac cap 90% of the ports and see how you go.

replace the plastic cam for the secondary air doors - its a pain in the **** but it should be mandatory in a rebuild.

Camaro-3

Im thinking about using the 17076028 ac delco kit from summit racing, is it a good kit? I'm ordering from summit since i have almost free shipping with all parts ordered. And Ill change accelerator pump too if not included in the kit. About the plastic cam, is it possible to order from local auto part?

zed-028

I'm in Australia and i refuse to pay our prices for that sort of stuff. i found mine online from somewhere in the USA for like $7-10 shipped to here. If i bought it from here it would have been closer to $50

Nothing wrong with the delco kits at all

paulo57509

Unless things have changed in the last +50 years, the best approach in getting the correct carb kit is to jot down the carb number (either stamped on the carb or stamped on a metal medallion attached to the side of the carb) and take that to the local auto parts store. They should be able to use that number and find the correct kit.

Buying a kit "by application" (make, year, model) is sketchy, especially if the carb is not original to the vehicle.

The accelerator pump (or the lip seal that goes on the end) is typically included in the kit.

Don't trip about having left over parts after you're done; just put them in your miscellaneous parts drawer.

five7kid

iTrader: (14)

About the only way to know which carb to go with is to pull them both apart. If there is no corrosion in the stored carb, and it is correct for the application, then I'd lean toward using it.

The biggest mistake made when disassembling a q-jet is to forget about the two air horn screws inside the choke tower and prying on the air horn when it doesn't come off. That distorts and cracks the air horn, and there really isn't any way to fix it. So, make sure you get those two screws out when taking it apart (number 7 in Figure 6C1-21 in this link https://www.thirdgen.org/forums/carb...e-rebuild.html - note there are 2 of them).

Every carburetor kit I've ever seen (and I've seen a bunch of them, from OEM to cheap chain store brands) have had excellent step-by-step instructions. Basically you take it apart by the numbers in the expanded illustration. Have a clean work area prepared before you start any work (I like to lay out a clean, old bath towel on the workbench). As you disassemble the car, lay out the parts & screws in the order they are removed. A can of carburetor parts cleaner (the gallon size variety) is recommended to soak the various parts. Compressed air is best for blowing out passages after soaking.

The only parts you should have left over are those replaced by pieces in the kit (gaskets, seals, etc.), and parts not used in your particular carb (most kits cover more than one variant of a carb model). Keeping things in order as you disassemble and reassemble helps prevent having to go back and redo something you missed.

15th ANNI T/A

I also have to rebuild my carb so I recently bought this kit from rock auto.

http://www.rockauto.com/en/moreinfo....n=__GIP__522__

It appears to be pretty decent quality and not too expensive. It will fit the standard(non CCC carbs). Hope the rebuild goes well.

Camaro-3

Rebuild is done! There was a lot of dirt inside of the carb, and finally I have rebuild mines.

paulo57509

stahrman0612

Good choice!! I was told by Cliff from Cliff's High Performance that you should always rebuild your original that came out of your car if possible.

Camaro-3

The only problem i found was the plastic cup missing! It runned without that for Years maybe... But what is the purpose of this plastic cup?

NoEmissions84TA

iTrader: (1)

PICTURE????

five7kid

iTrader: (14)

I think I know what he's talking about. It wasn't in the E4ME carbs.

http://www.crankshaftcoalition.com/w...4MV_carburetor

Figure 53, "Cavity Insert"