two bbl carb replacement - The 1947 - Present Chevrolet & GMC Truck Message Board Network

697498chevy · 02-06-2010, 08:15 PM

Looks like my old rochester is never coming back from the re-builder . Does Holley or Edelbrock make a good replacement carb for a '69 307 ? Guess I'd have to go with a manual choke . Any tips ? THANKS !

oldblue1968chevy · 02-06-2010, 08:42 PM

go 4bbl wahooo lol

id go man. choke i hate electric choke, maybe cause i cant get it adj.

junkyardjohn · 02-06-2010, 08:46 PM

I've had pretty good luck with edelbrock carbs. Without knowing anything about your motor, i would consider a 500 or 600 cfm & electric choke is just a matter of one hot wire. Aluminum 4 bbl. Intakes are cheap for small blocks. Aluminum intake,carb. & hei & dual exhaust (even better with headers) will wake your little small block right up. Hope this helps ya.

john

697498chevy · 02-06-2010, 09:18 PM

THANKS for the info , but I don't want to change the intake now .

junkyardjohn · 02-06-2010, 09:26 PM

I don't have much 2 bbl. Experiance, but i'd call edelbrock or hollys (whatever you prefer) tech. Line. They will supply you with the facts & figures.

697498chevy · 02-06-2010, 09:33 PM

Didn't think of that . THANKS !

capev86 · 02-07-2010, 01:38 AM

my 72 burb has a the original 74,000 mile 307 motor in it with the 2 barrel rochester. i rebuilt the carb and it still isn't quite right yet AND boring. only mods are new plugs, wires, a petronix electronic igntion conversion in the stock distributor, and mobil 1 10w-30 high mileage oil.

i purchased a new 4 row radiator and all the bracketry and planning to do an intake install at the same time since the cooling system will be apart.

parts so far:

Edelbrock performer intake (idle - 5500rpm range)
rochester 750 Q-jet from my dad's '84 350cid burb

parts to get:

Edelbrock q-jet rebuild kit, phenolic float, and hi-po accelerator pump

the carb will eventually go back on the 406sbc we had briefly in my dad's 84 burb when i get to the engine swap on my 72 burb, but for this summer the 307 will be towing the family camper and i want as much performance as i can get without tearing into the engine.

figure the q-jet will give me better low end response (torque), improved fuel economy and another 15-20hp at wide open throttle when the huge secondaries open up.

i prefer the characteristics of the spread bore carbs over square bore. edelbrock reportedly markets q-jet style knockoffs up to 750cfm. i hear a mild 350 will not use over 600, but when towing or in high altitude i'm sure the reserve capacity is handy. that 406 never had trouble and we kept the carb just as it came off the original 350.

junkyardjohn · 02-07-2010, 10:53 AM

IT SEEMS AS THOUGH ALOT OF PEOPLE HAVE THE MISCOMSEPTION THAT MORE FUEL IS ALWAYS BETTER. IT'S NOT. IN ORDER FOR FUEL TO DO ANYTHING TO MAKE HORSEPOWER IT HAS TO BE BURNED. IT HAS TO BE DELIVERED TO THE PISTONS MIXED WITH AIR. THAT THE CARBS JOB. NOW TO GET INTO THE CYLINDERS THE INTAKE VALVE OPENS & LETS THE MIX INTO IT TO BE BURNED. ONLY A CERTAIN AMOUNT OF MIX IS GOING TO ENTER WHILE THAT VALVE IS OPEN & IT IS DIRECTLY RELATED TO THE LENGTH OF TIME IT'S OPEN, SIZE, LIFT OF THE VALVE. THE AREA,THATS THE CAMSHAFTS JOB. NATURELY THE BIGGER THE CUMBUSTION CHAMBER, THE MORE FUEL YOU CAN BURN... BUT YOU HAVE TO GET IT THERE. EXESS FUEL WILL BE WASTED & YOUR TRUCK WILL ALWAYS RUN RICH. 750 CFM IS NOT TOO BIG FOR A 350 PROVIDING YOU CAN GET THE MIX IN & EXHAUST GASSES OUT. I SURE HOPE NOBODY THINKS I'M BEING A SMART @SS BY OVERSYMPLIFYING THIS, BUT YOU HAVE TO UNDERSTAND IN YOUR HEAD (AT LEAST I DO) HOW ALL THESE DIFFERENT PARTS WORK TOGETHER. THERE'S NOTHING MAJICAL OR ANY PARTS IN THERE THAT HAVE NO FUNCTION.

JOHN

cdowns · 02-07-2010, 12:01 PM

try seeing what NAPA wants for a rebuilt unit the local parts store should b able to get you one in just a few days

697498chevy · 02-07-2010, 12:50 PM

Never heard anything good about re-built carbs from parts stores . Any experience with NAPA carbs ? Already paid for one re-built carb that the builder can't make work . THANKS !

junkyardjohn · 02-07-2010, 01:36 PM

Quote:

Originally Posted by 697498chevy

never heard anything good about re-built carbs from parts stores . Any experience with napa carbs ? Already paid for one re-built carb that the builder can't make work . Thanks !

i never have either & i've never succesfully done it either.

now my 80 bb 1 ton has a rebuilt quadrajet on & it & it works great. But if was put on by the p.o. . There are carb. Specialist shops out there that spcialize in quadrajets. Google it. They aughta know what they are doing & seems like it would have to be cheaper?? John

19673ontree · 02-07-2010, 01:54 PM

I'm a little confused here ?
this make's a couple of post's complaining about sending these two barrell rochester's to someone and having bad luck ??? no way I would send one of those ANYWHERE just rebuild it yourself ,,
these carburetor's are AS BASIC AS IT GET'S ,,,,,,that insurance phrase come's to mind ,, A CAVE MAN COULD DO IT !!!!!!!!!!

all it take's is some good quality cleaner/degreaser and a $15 kit from napa ! THATS IT !

as far as you saying that your whole carb is gone those are on ebay all the time ,,,,,,
I'm sure that plenty of guy's on here have some to sell they used that same carburetor on 283's 307's 327's FOR YEAR'S !

19673ontree · 02-07-2010, 02:03 PM

since you don't have one here is a couple on ebay rightnow (NOT MINE BTW)
BUT MY ADVICE is even so that these say REBUILT don't trust that it's sort of like buying a engine from a guy that say's ITS REBUILT AND RUNS GOOD ! don't waste your time installing one of these carb's without going to napa spending $15 buck's and get it right ! much more enjoyable !

http://cgi.ebay.com/ebaymotors/NEW-6...Q5fAccessories

http://cgi.ebay.com/ebaymotors/New-7...Q5fAccessories

GASoline71 · 02-07-2010, 02:08 PM

Holley 2300 series 2 barrel carbs are good carbs. They come in either 350cfm or 500cfm. But... get your wallet out. For the price of a new 2 barrel like this you can get a 4 barrel.

http://www.summitracing.com/parts/HLY-0-7448/

Another avenue is to hit the junk yards for a used Rochester 2 barrel in decent shape, and rebuild it yourself. EZPZ...

Gary

*Sublvr72* · 02-07-2010, 03:58 PM

my 307/2bbl combo is so out of whack from the PO trying to rebuild it themselves. Instead of messing with it I'm going to replace it with a new intake and 4bbl.

So that means my 2bbl will be for sale shortly if you are interested. But you would have to rebuild it again to get the settings right.

*C-10 simplex* · 02-07-2010, 04:58 PM

Quote:

Originally Posted by 19673ontree

I'm a little confused here ?
this make's a couple of post's complaining about sending these two barrell rochester's to someone and having bad luck ??? no way I would send one of those ANYWHERE just rebuild it yourself ,,
these carburetor's are AS BASIC AS IT GET'S ,,,,,,that insurance phrase come's to mind ,, A CAVE MAN COULD DO IT !!!!!!!!!!

all it take's is some good quality cleaner/degreaser and a $15 kit from napa ! THATS IT !

as far as you saying that your whole carb is gone those are on ebay all the time ,,,,,,
I'm sure that plenty of guy's on here have some to sell they used that same carburetor on 283's 307's 327's FOR YEAR'S !

1) i don't know if you have Advance or Autozone in SC, but i got a reman 2GC from Champion for about $150 that works ok so far.

2) As pointed out above, i just got a 2GC from ebay for $5.50. It may need a rebuild, but i got mainly for learning purposes. But even so, a rebuild is not that difficult on these carbs. These guys can walk you thru it step-by-step (while i watch.) i think the haynes rochester book also can walk your thru it.

3) Speaking of holley, they have reman units of the 2GC available for about $215 with no core charge at Summit. If i had known about these, i would have bought one instead of at the parts store.

So, that's my opinion and the way i did was to just get a reman; i didn't rebuild mine at the time because the actual airhorn got bent in a garage accident.

But by staying with rochester, this way you don't have to fiddle with the choke, not that manual chokes are bad.

*C-10 simplex* · 02-07-2010, 05:16 PM

P.S., i think core charge on mine was $25.

2) you have to wonder about he mental state of someone who accepts a carb for rebuild, but then doesn't return it?

697498chevy · 02-07-2010, 07:37 PM

I've re-built this carb once or twice quite a few years ago . Sent it to an expert mostly because after 230,000 miles I thought it deserved it . As I've said before it came back twice and ran for a bit before the acell pump came apart and jammed the throttle . THANKS to this board I asked the builder if he could try an Echlin kit . He just e-mailed and said the Echlin pump looked good and my carb's on the way . THANKS to those on this board with helpful comments .

02-06-2010, 08:15 PM	#1
697498chevy Registered User Join Date: Jan 2009 Location: South Carolina Posts: 262	two bbl carb replacement Looks like my old rochester is never coming back from the re-builder . Does Holley or Edelbrock make a good replacement carb for a '69 307 ? Guess I'd have to go with a manual choke . Any tips ? THANKS !

02-06-2010, 08:42 PM	#2
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: two bbl carb replacement go 4bbl wahooo lol id go man. choke i hate electric choke, maybe cause i cant get it adj. __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

02-06-2010, 08:46 PM	#3
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	Re: two bbl carb replacement I've had pretty good luck with edelbrock carbs. Without knowing anything about your motor, i would consider a 500 or 600 cfm & electric choke is just a matter of one hot wire. Aluminum 4 bbl. Intakes are cheap for small blocks. Aluminum intake,carb. & hei & dual exhaust (even better with headers) will wake your little small block right up. Hope this helps ya. john __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

02-06-2010, 09:18 PM	#4
697498chevy Registered User Join Date: Jan 2009 Location: South Carolina Posts: 262	Re: two bbl carb replacement THANKS for the info , but I don't want to change the intake now .

02-06-2010, 09:26 PM	#5
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	Re: two bbl carb replacement I don't have much 2 bbl. Experiance, but i'd call edelbrock or hollys (whatever you prefer) tech. Line. They will supply you with the facts & figures. __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

02-06-2010, 09:33 PM	#6
697498chevy Registered User Join Date: Jan 2009 Location: South Carolina Posts: 262	Re: two bbl carb replacement Didn't think of that . THANKS !

02-07-2010, 01:38 AM	#7
capev86 Registered User Join Date: May 2009 Location: Eliot, Maine Posts: 1,314	Re: two bbl carb replacement my 72 burb has a the original 74,000 mile 307 motor in it with the 2 barrel rochester. i rebuilt the carb and it still isn't quite right yet AND boring. only mods are new plugs, wires, a petronix electronic igntion conversion in the stock distributor, and mobil 1 10w-30 high mileage oil. i purchased a new 4 row radiator and all the bracketry and planning to do an intake install at the same time since the cooling system will be apart. parts so far: Edelbrock performer intake (idle - 5500rpm range) rochester 750 Q-jet from my dad's '84 350cid burb parts to get: Edelbrock q-jet rebuild kit, phenolic float, and hi-po accelerator pump the carb will eventually go back on the 406sbc we had briefly in my dad's 84 burb when i get to the engine swap on my 72 burb, but for this summer the 307 will be towing the family camper and i want as much performance as i can get without tearing into the engine. figure the q-jet will give me better low end response (torque), improved fuel economy and another 15-20hp at wide open throttle when the huge secondaries open up. i prefer the characteristics of the spread bore carbs over square bore. edelbrock reportedly markets q-jet style knockoffs up to 750cfm. i hear a mild 350 will not use over 600, but when towing or in high altitude i'm sure the reserve capacity is handy. that 406 never had trouble and we kept the carb just as it came off the original 350.

02-07-2010, 10:53 AM	#8
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	Re: two bbl carb replacement IT SEEMS AS THOUGH ALOT OF PEOPLE HAVE THE MISCOMSEPTION THAT MORE FUEL IS ALWAYS BETTER. IT'S NOT. IN ORDER FOR FUEL TO DO ANYTHING TO MAKE HORSEPOWER IT HAS TO BE BURNED. IT HAS TO BE DELIVERED TO THE PISTONS MIXED WITH AIR. THAT THE CARBS JOB. NOW TO GET INTO THE CYLINDERS THE INTAKE VALVE OPENS & LETS THE MIX INTO IT TO BE BURNED. ONLY A CERTAIN AMOUNT OF MIX IS GOING TO ENTER WHILE THAT VALVE IS OPEN & IT IS DIRECTLY RELATED TO THE LENGTH OF TIME IT'S OPEN, SIZE, LIFT OF THE VALVE. THE AREA,THATS THE CAMSHAFTS JOB. NATURELY THE BIGGER THE CUMBUSTION CHAMBER, THE MORE FUEL YOU CAN BURN... BUT YOU HAVE TO GET IT THERE. EXESS FUEL WILL BE WASTED & YOUR TRUCK WILL ALWAYS RUN RICH. 750 CFM IS NOT TOO BIG FOR A 350 PROVIDING YOU CAN GET THE MIX IN & EXHAUST GASSES OUT. I SURE HOPE NOBODY THINKS I'M BEING A SMART @SS BY OVERSYMPLIFYING THIS, BUT YOU HAVE TO UNDERSTAND IN YOUR HEAD (AT LEAST I DO) HOW ALL THESE DIFFERENT PARTS WORK TOGETHER. THERE'S NOTHING MAJICAL OR ANY PARTS IN THERE THAT HAVE NO FUNCTION. JOHN __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

02-07-2010, 12:01 PM	#9
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: two bbl carb replacement try seeing what NAPA wants for a rebuilt unit the local parts store should b able to get you one in just a few days __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

02-07-2010, 12:50 PM	#10
697498chevy Registered User Join Date: Jan 2009 Location: South Carolina Posts: 262	Re: two bbl carb replacement Never heard anything good about re-built carbs from parts stores . Any experience with NAPA carbs ? Already paid for one re-built carb that the builder can't make work . THANKS !

02-07-2010, 01:54 PM	#12
19673ontree CAN'T FIX NOTHIN Join Date: Sep 2006 Location: SOUTHRUST VIRGINIA !!! Posts: 2,112	Re: two bbl carb replacement I'm a little confused here ? this make's a couple of post's complaining about sending these two barrell rochester's to someone and having bad luck ??? no way I would send one of those ANYWHERE just rebuild it yourself ,, these carburetor's are AS BASIC AS IT GET'S ,,,,,,that insurance phrase come's to mind ,, A CAVE MAN COULD DO IT !!!!!!!!!! all it take's is some good quality cleaner/degreaser and a $15 kit from napa ! THATS IT ! as far as you saying that your whole carb is gone those are on ebay all the time ,,,,,, I'm sure that plenty of guy's on here have some to sell they used that same carburetor on 283's 307's 327's FOR YEAR'S ! __________________ 1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC Last edited by 19673ontree; 02-07-2010 at 01:57 PM.

02-07-2010, 02:03 PM	#13
19673ontree CAN'T FIX NOTHIN Join Date: Sep 2006 Location: SOUTHRUST VIRGINIA !!! Posts: 2,112	Re: two bbl carb replacement since you don't have one here is a couple on ebay rightnow (NOT MINE BTW) BUT MY ADVICE is even so that these say REBUILT don't trust that it's sort of like buying a engine from a guy that say's ITS REBUILT AND RUNS GOOD ! don't waste your time installing one of these carb's without going to napa spending $15 buck's and get it right ! much more enjoyable ! http://cgi.ebay.com/ebaymotors/NEW-6...Q5fAccessories http://cgi.ebay.com/ebaymotors/New-7...Q5fAccessories __________________ 1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC

02-07-2010, 03:58 PM	#15
Sublvr72 Account Suspended Join Date: May 2004 Location: Simi Valley, CA Posts: 1,387	Re: two bbl carb replacement my 307/2bbl combo is so out of whack from the PO trying to rebuild it themselves. Instead of messing with it I'm going to replace it with a new intake and 4bbl. So that means my 2bbl will be for sale shortly if you are interested. But you would have to rebuild it again to get the settings right.

02-07-2010, 05:16 PM	#17
C-10 simplex Account Suspended Join Date: Dec 2008 Location: indisclosed Posts: 1,515	Re: two bbl carb replacement P.S., i think core charge on mine was $25. 2) you have to wonder about he mental state of someone who accepts a carb for rebuild, but then doesn't return it?

02-07-2010, 07:37 PM	#18
697498chevy Registered User Join Date: Jan 2009 Location: South Carolina Posts: 262	Re: two bbl carb replacement I've re-built this carb once or twice quite a few years ago . Sent it to an expert mostly because after 230,000 miles I thought it deserved it . As I've said before it came back twice and ran for a bit before the acell pump came apart and jammed the throttle . THANKS to this board I asked the builder if he could try an Echlin kit . He just e-mailed and said the Echlin pump looked good and my carb's on the way . THANKS to those on this board with helpful comments .



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