Was wondering what you guys think . I have been out the game for a little while and I just bought a 71 dart with a 340. It is .30 over with flat top piston and stock j heads not sure if they have the bigger valves. It has the .484 purple shaft cam with headers and exhaust to rear axle. Has air gap dual plane intake , 3000 stall and 3.23 gears . It needs a carb and I was wondering what kind and how big. It will be used as a street strip car . Im thinking of a proform 600 to 650 with vaccum secondaries or a edelbrock 600 or 650. Any suggestions oh the gears are 3.23 with a 14 inch tires and I will be using a 14 inch slick. How big of a slick under stock wheel wells can I fit , 8 or 9 inch. Thanks and I look forward to your help.
carb choice and slick size
- Thread starter 68cuda78
- Start date
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650 DP as the smallest choice.
IMO, a 650 CFM Holley carb w/vacuum secondaries or AVS styled Edelbrock and 3.91 gears. Skip the slick and use a drag radial so you can "leagally" drive the street and have traction/grip on the road while having a great abilty to launch at the track. Stay at or about a 26 inch diameter tire.
SRT_DSTRHOLC
Well-Known Member
You can find a 750 vac Sec pretty cheap. 3.91 gear and a 27-28in tire
If you are serious about performance go with one of the holley double pumpers...even if it is a Proform or QFT...the parts are easier to find and get with a holley based carb.
Most A bodies with fit a 9 x 28 slick with minor problems...if you are using a 14 inch diameter wheel..there is a limited number of sizes available...there are some 8 x 26.5 slicks also..
Most A bodies with fit a 9 x 28 slick with minor problems...if you are using a 14 inch diameter wheel..there is a limited number of sizes available...there are some 8 x 26.5 slicks also..
fanofpetty
senior member
I'd personally use a 750 CFM holley
mischiefdart
Well-Known Member
What wheels are on the car? I would go with 15" rallies with enough rear space to fit the widest tire inside the wheel well. There are more than one company selling custom built to your spec rallies.
SRT_DSTRHOLC
Well-Known Member
Don't like them and not really a performance carb. More of a cruising carb.
OldmanRick
Well-Known Member
While a 750 carb will work perfectly fine in your application, i believe i detect a little more "street" in your post rather then "strip". If your staying with the 3.23's, you'll be just as happy with the 650 in my opinion. And yes, the Thunder series is the Eddy carb i would choose.
It will see the strip a lot I hope this year but I will be driving it there its not going to be a trailer queen. I may change gears to 3.55 or 3.91 in future but not sure. I think for now the 650 thunder series would be perfect...
OldmanRick
Well-Known Member
Main reason i wouldn't mind the 650 for now is, assuming you'll run 105ish mph in the quarter, with the 3.23's you'll get into 3rd gear around the 1000' mark and finish from there to the stripe in the 4200/4500 rpm range and i don't believe the 100 cfm's will make any difference at that point.
moper
Well-Known Member
The Thunder AVS 650 is a good carb for you - you will need to tune it just like any other carb so buy the strip kit with it. With the gearing you have the swmaller carb will give you a better ET and be more fun on the street.
I agree with these guys. They have good reasons behind the choice.
While a Carter isn't a strip carb by design, most Holleys are not a street carb by design ethier. They will work great. Ethier one. Carter's can perform!
The difference between the carbs CFM sizes, 650 vs. 750 is just a few HP. You'll not see it at the track in a big way but you'll notice a much better throttle response on the street.
While a Carter isn't a strip carb by design, most Holleys are not a street carb by design ethier. They will work great. Ethier one. Carter's can perform!
The difference between the carbs CFM sizes, 650 vs. 750 is just a few HP. You'll not see it at the track in a big way but you'll notice a much better throttle response on the street.
holley makes street carbs..and holley make race carbs....eddy makes street carbs...
go to the race track...and unless someone has to run an certain carb by rules such as NHRA stockers and super stocker are required to run OEM carters....YOU will find that 99% percent of the carbs are holleys....
go to the race track...and unless someone has to run an certain carb by rules such as NHRA stockers and super stocker are required to run OEM carters....YOU will find that 99% percent of the carbs are holleys....
3000 stall and vacuum secondaries.. No thanks.
doogievlg
Well-Known Member
Why not get both? Holley carbs are a dime a dozen on craigslist and websites like that. I have the Thunder series carb on my dart right now and It did great on the street the 2 times I got to drive it. If you are running only 1/8 mile I don't think you will be getting high enough in your MPH do need the extra CFM. I am no carb guy btw so someone please correct me if I am wrong.
I thought the edelbrock carb is like mechanical secondaries
doogievlg
Well-Known Member
The Thunder series has advanced vacume secondaries...AVS.
OldmanRick
Well-Known Member
Aluminum Vacuum Secondaries.........Although i've seen it referred to as a "Air Valve Secondary" also
P.S. the AFB = Aluminum Four Barrel
winstoninwisc
Taint easy livin free,season ticket ona 1wayride
i have a 650 holley df/dp awsome carbs when set it can be 50 here 1 minute and 90 the next took care of that prob with an airgap i have 750 vac seconds prob should be rebuilt if set right it only takes what it wants i am running a 750df/dp to start on new motor prob have to jump up 900 or so pm for a good price on 650 d/p 750 dp ,750 vac seconds all up to your tuner also also lott of macuni"s older was for my sleds but bikes as well or 1 funky 4-12 carb setup
Im also thinking of a 650 holley street avenger ...
ValiantRacing
Well-Known Member
750 Holley and 3.91 gears, I have running that setup for years in a 71 Scamp, run 14s on the street and switch too 15s and drag radials for track.. runs 12 flat all day long
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