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#2470696 - 03/22/18 07:38 PM single carb NSS racing deal
fourgearsavoy Offline


Registered: 12/07/04
Posts: 9252
Loc: Rittman Ohio
I want to race in NSS this summer but I really don't have the coin to do it right with an Indy intake or a worked cross ram.
So I am looking at the 11.50 class with a single Edelbrock and I'm not sure a 750 will do the job. I have been looking at the 800 AVS Thunder carb but I can get a 750 Performer for about half the price. Do you think 50 CFM will be that much differn't shruggy
Has anyone ever run this class with a single Carter/Edelbrock style carb?
Thanks
Gus beer
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#2470699 - 03/22/18 07:44 PM Re: single carb NSS racing deal [Re: fourgearsavoy]
lewtot184 Offline
master

Registered: 06/09/08
Posts: 2591
Loc: usa
the 750's don't flow near 750, probably a little over 700. 800's probably don't flow 800 but i'd bet around 780. the extra venturi area of the 800 is what i'd be looking for. i'd do the 800; they can be made to work.

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#2470710 - 03/22/18 08:19 PM Re: single carb NSS racing deal [Re: fourgearsavoy]
nss guy Offline
pro stock

Registered: 09/21/06
Posts: 1282
Loc: central ohio
I have seen several racers with single 600 or 750 afb's.
Remember you will be racing on an index, just need to be consistent not the fastest. Heck all the manifold test I've seen show the crossram down 90+ horsepower.


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#2470715 - 03/22/18 08:30 PM Re: single carb NSS racing deal [Re: fourgearsavoy]
67mprfan Offline
super stock

Registered: 05/01/05
Posts: 835
Loc: ohio
Don't they also allow the use of a single Holley in 1 of the classes
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71 demon stock stroke 440/indy ez-1 running 10.10 @ 132.14 mph in the 1/4 and 6.36 @ 107.46 mph in the 1/8 not in the same weekend but It did it then I sold it.
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#2470858 - 03/23/18 08:15 AM Re: single carb NSS racing deal [Re: fourgearsavoy]
66coronet Offline
super stock

Registered: 03/08/04
Posts: 768
Loc: Georgia
I know a single 800 will work. That is what we run on our 67 coronet wagon in NSS. Corky Bumpus on a mopar and Jim Netherland on a buick also run a single 800.

We worked with an avs and the hesitation is hard to get rid of. Not a bog but a slight hesitation. I would go with an old style 800 performer series carb.It will work with some tuning.

Something else worth looking into. There is a new edelbrock carb. It has annular boosters to help it during the transition. I have not looked at the sizes available but its worth looking into.

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#2470859 - 03/23/18 08:16 AM Re: single carb NSS racing deal [Re: fourgearsavoy]
dvw Offline
master

Registered: 03/16/06
Posts: 7002
Loc: MI, usa
Indexes are on a .25 second scale now instead of .50 second. The 750's are pretty inexpensive used. I'd try 750.
Doug

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#2470908 - 03/23/18 10:44 AM Re: single carb NSS racing deal [Re: fourgearsavoy]
lewtot184 Offline
master

Registered: 06/09/08
Posts: 2591
Loc: usa
I got rid of the 800avs hesitation by getting rid of .113" primary jets and going to a smaller squirter. playing with step-up springs can help.

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#2470965 - 03/23/18 12:42 PM Re: single carb NSS racing deal [Re: 67mprfan]
jwb123 Offline
member

Registered: 11/17/15
Posts: 160
Loc: Missouri
I believe only the NMCA nostalgia super stock classes allows single carb combos. Victory and NSS Inc. only allow dual carbs. Not sure about the other groups. The Modman from Indy seems to work OK, a lot of guys used to run the older edelbrock 2x4 manifolds. And as mentioned you pick an index, so if its a few tenths off, no big deal. I ran a 63 factory cross ram for several years, it was 4 tenths slower than a edelbrock victor Jr , I modified to run 2 carbs. Rules state you must run a as cast manifold but are allowed to modify the top. I have access to a spool gun to weld alumninum, I got $350 in my intake and two used 750 federal mogul AFB carbs off ebay for $75 each, car has run a best of 9.65 @ 140mph. The best I got the cross ram to run was 10.01 & 138mph, same engine only manifold change, the same carbs on both manifolds.

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#2470982 - 03/23/18 01:19 PM Re: single carb NSS racing deal [Re: jwb123]
DoubleD Offline
top fuel

Registered: 01/22/03
Posts: 1872
Loc: NE Ohio
Run the AFB's a 750 will work good - 800 is little better up top but lots of 750's out there for sale - there are a few tricks you can apply to them to make them work better and be real consistent - but they are easy to tune - glad to help you out to get you to the D42 race

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#2471100 - 03/23/18 06:18 PM Re: single carb NSS racing deal [Re: DoubleD]
fourgearsavoy Offline


Registered: 12/07/04
Posts: 9252
Loc: Rittman Ohio
Thanks a lot guys I think I will get a 750 and tune it from there. I have an AFR meter that I'm putting on the car this year too so that should at least tell me where the tune is.
The car has run 10.91 with a big Holley so it will probably slow down some with a 750 but maybe not shruggy I might be overcarbed.
So I'll be looking for a Performer 750 that hasn't been touched yet so I have a good base to start tuning with.
Being a stick car I don't think I will have a bog issue because I leave on the 2-step at 4500 with the pedal on the wood.

Gus beer
_________________________
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60

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#2471116 - 03/23/18 06:48 PM Re: single carb NSS racing deal [Re: fourgearsavoy]
nss guy Offline
pro stock

Registered: 09/21/06
Posts: 1282
Loc: central ohio
Originally Posted By fourgearsavoy
Thanks a lot guys
Being a stick car I don't think I will have a bog issue because I leave on the 2-step at 4500 with the pedal on the wood.

Gus beer


Sounds like fun!!

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#2471153 - 03/23/18 08:42 PM Re: single carb NSS racing deal [Re: nss guy]
fourgearsavoy Offline


Registered: 12/07/04
Posts: 9252
Loc: Rittman Ohio
Originally Posted By nss guy
Originally Posted By fourgearsavoy
Thanks a lot guys
Being a stick car I don't think I will have a bog issue because I leave on the 2-step at 4500 with the pedal on the wood.

Gus beer


Sounds like fun!!


Yeah let the clutch fly and start rowin gears fast because I'm sure you know how fast these 493 Indy head engines rev.

Well I got a line on a few carbs already thumbs One is an older Competition Series Carter AFB and he also has a few Eddy carbs but not sure which ones.
So I'll pick up a 12 pack and go check them out tomorrow laugh2

Gus beer


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23231224_1750435168331817_8297307229037431265_n.jpg


_________________________
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60

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#2471251 - 03/24/18 08:06 AM Re: single carb NSS racing deal [Re: fourgearsavoy]
dvw Offline
master

Registered: 03/16/06
Posts: 7002
Loc: MI, usa
Lots of guys that run trans brakes and sticks with AFB's run with the rear air door wedged open. It's easy to try with a couple of pieces of 1/4" vacuum line stuffed into the upper corners of the rear casting above the door weights. Doesn't work well with foot brake or low RPM full throttle leave.
Doug

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#2471437 - 03/24/18 04:32 PM Re: single carb NSS racing deal [Re: dvw]
fourgearsavoy Offline


Registered: 12/07/04
Posts: 9252
Loc: Rittman Ohio
Thanks Doug I was wondering how that door reacts when on the rev limiter for a second. Will it flutter on the 2-step and not work correctly shruggy Maybe someone filmed it with a Go-pro to see what happens.
I'm looking forward to testing as soon as the snow melts around here.

Gus beer
_________________________
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60

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#2471447 - 03/24/18 04:44 PM Re: single carb NSS racing deal [Re: fourgearsavoy]
tex013 Offline
top fuel

Registered: 03/27/09
Posts: 1748
Loc: Sydney,Australia
A mate with a cross ram 409 chev stroker took the air door and weights out completely . Drives it on street a bit said no issues

Tex
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#2471550 - 03/24/18 07:40 PM Re: single carb NSS racing deal [Re: fourgearsavoy]
hysteric Offline
member

Registered: 04/28/08
Posts: 21
Loc: Aus
Pick the one with the longest Booster. If there is one.

A Genuine Carter 750 will have a longer booster than Later Federal Mogul or Edelbrock Carbs which places the Booster in the correct position of being at the Vena Contractor.

The later carbs got the Booster from the 625 series carbs which has the Vena Contractor mush higher.

Here are the 2 different lengths:
[img]https://photos.google.com/share/AF1QipP8...nR2cGFpRFIwMkFR[/img]

I have also installed holley air bleeds in the top of mine to make it more tunable.

Hysteric


Edited by hysteric (03/24/18 07:44 PM)

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#2471590 - 03/24/18 09:17 PM Re: single carb NSS racing deal [Re: fourgearsavoy]
rowin4 Offline
master

Registered: 06/30/05
Posts: 6086
Loc: gulfport, ms, west mi
It seems to me back in the late 60's we tightened the spring on the secondary door to get more fuel less air on the hit ? heck that's 50 years ago. Never heard of anyone back then taking it out. Maybe that was stone age thinking. If it wasn't in Hot Rod Magazine we didn't know jack schit.


Brain just had a recall that was AVS carb , 1968 model, Didn't think a AFB had a secondary door.


Edited by rowin4 (03/24/18 09:23 PM)
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#2471605 - 03/24/18 09:52 PM Re: single carb NSS racing deal [Re: jwb123]
Scully Online   content
member

Registered: 02/10/16
Posts: 75
Loc: PA
Originally Posted By jwb123
I believe only the NMCA nostalgia super stock classes allows single carb combos. Victory and NSS Inc. only allow dual carbs. Not sure about the other groups. The Modman from Indy seems to work OK, a lot of guys used to run the older edelbrock 2x4 manifolds. And as mentioned you pick an index, so if its a few tenths off, no big deal. I ran a 63 factory cross ram for several years, it was 4 tenths slower than a edelbrock victor Jr , I modified to run 2 carbs. Rules state you must run a as cast manifold but are allowed to modify the top. I have access to a spool gun to weld alumninum, I got $350 in my intake and two used 750 federal mogul AFB carbs off ebay for $75 each, car has run a best of 9.65 @ 140mph. The best I got the cross ram to run was 10.01 & 138mph, same engine only manifold change, the same carbs on both manifolds.
What RPM were you going through the traps at with the cross ram.

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#2476487 - 04/02/18 08:10 PM Re: single carb NSS racing deal [Re: fourgearsavoy]
GTSDave Offline


Registered: 01/19/03
Posts: 3024
Loc: Richmond, Tx. (Houston)
I am running an old heavily modified STR15 with a pair of Diamondback Engines modified 800 Eddies.

I launch at 5700 and shift at 7600 (Jerico.) Best 1/8th so far was a 6.13 with this combo.

-Dave
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#2476543 - 04/02/18 09:50 PM Re: single carb NSS racing deal [Re: fourgearsavoy]
ProSport Offline
I Live Here

Registered: 01/20/03
Posts: 17591
Loc: Akron, Ohio
Gus I think you should hunt for an 800, you are definitely not over carbed right now. I sent you a text.
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