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new carbs for 426 hemi?? #1008234
06/06/11 10:14 PM 06/06/11 10:14 PM
Joined: Apr 2003
Posts: 1,131
Kent, WA
T
triple_green Offline OP
super stock
triple_green  Offline OP
super stock
T

Joined: Apr 2003
Posts: 1,131
Kent, WA
In our on going effort to get the 1969 426 hemi to run right, my mechanic has decided that we need to try some New Carbs. The factory carbs have been rebuilt 3 times and he says they are dumping gas and fouling the plugs in short order.

What would you guys suggest in place of the carters?
Edelbrock carb(s)? What model and size?

Thanks!

68 Charger, 383 HP console auto, spring green, stock restoration
Re: new carbs for 426 hemi?? [Re: triple_green] #1008235
06/06/11 10:19 PM 06/06/11 10:19 PM
Joined: Dec 2006
Posts: 602
N.E.Ohio
P
pacifica Offline
mopar
pacifica  Offline
mopar
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Joined: Dec 2006
Posts: 602
N.E.Ohio
If you have original AFB carbs for your car, I would suggest another mechanic or try here

http://www.harmsauto.com/
Re: new carbs for 426 hemi?? [Re: triple_green] #1008236
06/06/11 10:43 PM 06/06/11 10:43 PM
Joined: Jan 2003
Posts: 1,387
Houston,Tx.
L
Lee446 Offline
pro stock
Lee446  Offline
pro stock
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Joined: Jan 2003
Posts: 1,387
Houston,Tx.
Depends on your setup. If you are running a factory 2x4 you are limited to the 600 Edelbrocks as the 750's butterflys are too big to work. The holes in the intake's carb mounting flange are too small. No Holleys will fit that intake either.
If you decide to replace your carbs, drop me a pm. I have a pair of like new 600's that I bought from Mancini last august and they were set up by Jake, of Jakes Garage in Detroit, a Hemi expert. They work perfectly and have the correct fittings to use the factory fuel lines. I went to a pair of 800's on a ported/modified intake on my 528. I will make you a good deal if you are interested. I am sure you also know not to let your carbs go if they are original Hemi carbs!
Re: new carbs for 426 hemi?? [Re: pacifica] #1008237
06/06/11 10:50 PM 06/06/11 10:50 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
ScottSmith_Harms  Offline
Mr Wizzard

Joined: Jan 2003
Posts: 42,714
Spokane Washington
TripleGreen,

If I restore your carbs THEY WILL run right and look OEM correct, I absalutely guarantee it!
Re: new carbs for 426 hemi?? [Re: ScottSmith_Harms] #1008238
06/06/11 10:58 PM 06/06/11 10:58 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
ScottSmith_Harms  Offline
Mr Wizzard

Joined: Jan 2003
Posts: 42,714
Spokane Washington
BTW, should you decide to shelve your originals and are set on new replacements I can provide you with those as well (Hemi Clone carbs, 600 or 750 cfm). Either way it's up to you.

My Clones look like this pic, OE style tags, linkage, fuel inlet fittings, automatic chokes, etc. are all optional. The lids are the correct diameter (because they are vintage lids) to fit your original air cleaner unlike any other new carb you can purchase new.

*The carbs above are original 69's I restored for another customer
Re: new carbs for 426 hemi?? [Re: ScottSmith_Harms] #1008239
06/07/11 01:41 PM 06/07/11 01:41 PM
Joined: Apr 2003
Posts: 1,131
Kent, WA
T
triple_green Offline OP
super stock
triple_green  Offline OP
super stock
T

Joined: Apr 2003
Posts: 1,131
Kent, WA
Just curious, what is the CFM of the OEM Carters?

Thanks!

Mark

68 Charger, 383 HP console auto, spring green, stock restoration
Re: new carbs for 426 hemi?? [Re: triple_green] #1008240
06/07/11 03:01 PM 06/07/11 03:01 PM
Joined: Jan 2003
Posts: 42,714
Spokane Washington
ScottSmith_Harms Offline
Mr Wizzard
ScottSmith_Harms  Offline
Mr Wizzard

Joined: Jan 2003
Posts: 42,714
Spokane Washington
OEM Hemi carbs are rated at 625cfm each, older Competion Series Carters and new Edelbrocks are rated at 600cfm each, however, all 3 above mentioned carbs are basically the same castings so there is likely little if any actual flow difference between them.

*FYI, VERY few Hemis require dual 750 cfm carbs, only BIG horse power engines need that much cfm to stay happy.
Re: new carbs for 426 hemi?? [Re: ScottSmith_Harms] #1008241
06/07/11 03:47 PM 06/07/11 03:47 PM
Joined: Jul 2006
Posts: 4,179
California
mickm Offline
master
mickm  Offline
master

Joined: Jul 2006
Posts: 4,179
California
i have they edelbrock thunders, i thought they were 650cfm. are these the ones you are referring to?
Re: new carbs for 426 hemi?? [Re: triple_green] #1008242
06/07/11 04:06 PM 06/07/11 04:06 PM
Joined: Jun 2008
Posts: 3,916
usa
L
lewtot184 Offline
master
lewtot184  Offline
master
L

Joined: Jun 2008
Posts: 3,916
usa
Quote:

In our on going effort to get the 1969 426 hemi to run right, my mechanic has decided that we need to try some New Carbs. The factory carbs have been rebuilt 3 times and he says they are dumping gas and fouling the plugs in short order.

What would you guys suggest in place of the carters?
Edelbrock carb(s)? What model and size?

Thanks!

if they're dumping fuel why don't you check the fuel pressure before you buy new carbs?
Re: new carbs for 426 hemi?? [Re: lewtot184] #1008243
06/07/11 04:41 PM 06/07/11 04:41 PM
Joined: Jul 2006
Posts: 4,179
California
mickm Offline
master
mickm  Offline
master

Joined: Jul 2006
Posts: 4,179
California
the carters and edelbrocks are very sensitive to fuel pressure, and i believe 6psi is max, 5 is preferred, but you should look that up to be sure.
Re: new carbs for 426 hemi?? [Re: mickm] #1008244
06/08/11 01:19 PM 06/08/11 01:19 PM
Joined: Apr 2003
Posts: 1,131
Kent, WA
T
triple_green Offline OP
super stock
triple_green  Offline OP
super stock
T

Joined: Apr 2003
Posts: 1,131
Kent, WA
we pinched off the fuel line to reduce pressure and it still dumps gas down.

Vacuum is 17-18 lbs

68 Charger, 383 HP console auto, spring green, stock restoration
Re: new carbs for 426 hemi?? [Re: triple_green] #1008245
06/08/11 01:21 PM 06/08/11 01:21 PM
Joined: Jan 2003
Posts: 75,343
A gulag near you.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 75,343
A gulag near you.
Quote:

we pinched off the fuel line to reduce pressure and it still dumps gas down.





You did what ? pressure is a resistance to flow ....
Re: new carbs for 426 hemi?? [Re: JohnRR] #1008246
06/08/11 01:27 PM 06/08/11 01:27 PM
Joined: Nov 2005
Posts: 15,127
85086
moparpollack Offline
Lil Herman
moparpollack  Offline
Lil Herman

Joined: Nov 2005
Posts: 15,127
85086
Quote:

Quote:

we pinched off the fuel line to reduce pressure and it still dumps gas down.





You did what ? pressure is a resistance to flow ....




56 Plaza 63 D100 step side 67 Coronet, 68 Roadrunner, 69 Super Bees, 69 Coronet 500 convertible, 70 Roadrunner Post, 79 D150 360, and a severe case of Mopar a,d,d
Re: new carbs for 426 hemi?? [Re: triple_green] #1008247
06/08/11 01:47 PM 06/08/11 01:47 PM
Joined: Jul 2006
Posts: 4,179
California
mickm Offline
master
mickm  Offline
master

Joined: Jul 2006
Posts: 4,179
California
Quote:

we pinched off the fuel line to reduce pressure and it still dumps gas down.

Vacuum is 17-18 lbs



no, you need a pressure gauge in there to see what it is doing. that won't do it.

but it doesn't sound like you have found the issue. where is it dumping from? and after shutting off, or when it is running? sounds like you need to look at this closer and see what is really going on. are the floats really adjusted correctly? it's easy to take the top of the carb off and find out.

my guess is line pressure, but depends on when it is happening...
Re: new carbs for 426 hemi?? [Re: mickm] #1008248
06/08/11 04:35 PM 06/08/11 04:35 PM
Joined: Apr 2003
Posts: 1,131
Kent, WA
T
triple_green Offline OP
super stock
triple_green  Offline OP
super stock
T

Joined: Apr 2003
Posts: 1,131
Kent, WA
runs and then shut off and it's still leaking..after we turn it off it won't start up again...he is pretty sure the floats are adj correctly

68 Charger, 383 HP console auto, spring green, stock restoration
Re: new carbs for 426 hemi?? [Re: triple_green] #1008249
06/08/11 04:44 PM 06/08/11 04:44 PM
Joined: Jan 2003
Posts: 75,343
A gulag near you.
JohnRR Offline
I Win
JohnRR  Offline
I Win

Joined: Jan 2003
Posts: 75,343
A gulag near you.
Quote:

he is pretty sure the floats are adj correctly



PRETTY SURE ???
Re: new carbs for 426 hemi?? [Re: JohnRR] #1008250
06/08/11 04:50 PM 06/08/11 04:50 PM
Joined: Oct 2008
Posts: 1,894
Mira Loma, CA
69B3GT Offline
top fuel
69B3GT  Offline
top fuel

Joined: Oct 2008
Posts: 1,894
Mira Loma, CA
Quote:

Quote:

he is pretty sure the floats are adj correctly



PRETTY SURE ???



I was just about to say that

Re: new carbs for 426 hemi?? [Re: 69B3GT] #1008251
06/08/11 06:33 PM 06/08/11 06:33 PM
Joined: Jun 2008
Posts: 3,916
usa
L
lewtot184 Offline
master
lewtot184  Offline
master
L

Joined: Jun 2008
Posts: 3,916
usa
those carbs are very simple. float level is too high, too much fuel pressure, or dirt in the needle and seats; thats all it can be be. try a different mechanic or better yet learn to fix'em yourself. you can do it!

Re: new carbs for 426 hemi?? [Re: JohnRR] #1008252
06/08/11 07:41 PM 06/08/11 07:41 PM
Joined: Jul 2006
Posts: 4,179
California
mickm Offline
master
mickm  Offline
master

Joined: Jul 2006
Posts: 4,179
California
Quote:

Quote:

he is pretty sure the floats are adj correctly



PRETTY SURE ???



is that like being "pretty sure" the rubber didn't break??

uh-uh.....
Re: new carbs for 426 hemi?? [Re: mickm] #1008253
06/08/11 08:15 PM 06/08/11 08:15 PM
Joined: Apr 2003
Posts: 1,131
Kent, WA
T
triple_green Offline OP
super stock
triple_green  Offline OP
super stock
T

Joined: Apr 2003
Posts: 1,131
Kent, WA
where can I find out what the float height should be?

Thanks!

68 Charger, 383 HP console auto, spring green, stock restoration
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