Picking the right carb
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Picking the right carb

  1. #1
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    Default Picking the right carb

    I'm getting ready to purchase a carb. for my new 350 and I was hoping for feedback from the experts. This will be going in a 65 Nova with a turbo350 (possibly a 700R4 down the line) with a 2200 stall. Gas mileage is of no concern.

    Specs:
    350ci
    67cc late model steel heads with a fair amount of port work (casting #10110810)
    billet roller cam Int, Dur @.050-228 Exh [email protected] .050-228 Int lift-492 Exh Lift- 492 Lobe center 109 Hyd
    1.5 roller rockers
    speed pro flat tops (about 9.5 to 1)
    basic MSD dist. and coil
    Air gap RPM performer (gasket matched)
    long tube headers with 3" exhaust

    I was thinking a 750 with mechanical secondaries.

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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    nice 650dp will do fine on that, ya don't wanna over carb a street car. you went alil far on the exhaust already, hope those headers have small primaries!

    Dare to be different, if it turns out great you can claim you planned it that way.

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  4. #3
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    IMO, i would go with a 750 DP mech sec (4779)...its prob not a regular street driven car!

    u can find them on EBay or Raceingjunk.com or at ur local Swap meet for good prices ...dont pay a fortune for one

    just my .02 cents

    FastRat

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  6. #4
    Senior Member Notalent's Avatar
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    If your just cruising looking for good performance I would go with the Holley Street Avenger 670CFM. If your looking for more power, go with the 650 double pumper. 750cfm would be over kill for this engine IMO. I had a similar engine in my chevelle before I swapped and tested the edel 650, holley 670cfm and the holley 750dp. The 750dp gave me more punch when crusing around 50mph and kicked down well, but all around the 670 was by far the best.
    "Pain is a figment of your Imagination"

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    Thanks for the feedback. As far as the exhaust is concerned, I haven't purchased it yet, so I could change my plans. I was thinking the 3" exhaust because I love the sound of a loud hot rod, but not if it's going to cost me performance.

  8. #6
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by husqy510 View Post
    Thanks for the feedback. As far as the exhaust is concerned, I haven't purchased it yet, so I could change my plans. I was thinking the 3" exhaust because I love the sound of a loud hot rod, but not if it's going to cost me performance.
    i've got alot of buddies with car that lope and sound badass at idle, but they can't get outta their own way in a race to me, your exhaust plans are alil too free flowing for a street car, a set of shorty headers would serve ya better i'd think, but that's just my .02

    Dare to be different, if it turns out great you can claim you planned it that way.

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  9. #7
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    I think the motor combination should run good for what we have, but I didn't know the exhaust could be too free flowing. We definately wanted a good sound, but not at the cost of performance, thus the mild cam.

  10. #8
    cfm
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    3000 Stall and 650DP.

    If you had better heads - ie:min of Vortecs - then same stall and 750DP. Although, 650 would still be fine.

  11. #9
    steelcomp was here
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    Quote Originally Posted by IMPATIENT 1 View Post
    i've got alot of buddies with car that lope and sound badass at idle, but they can't get outta their own way in a race to me, your exhaust plans are alil too free flowing for a street car, a set of shorty headers would serve ya better i'd think, but that's just my .02
    Shorty headers, no. Very seldom much power gain with shorty's. Small tube full length headers w/ 2.5" exhaust, yes.
    650cfm dp.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  12. #10
    Senior Member CK7684's Avatar
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    The issue with the larger exhaust pipes is that the gases cool down too quickly, which slows them down. You want to keep the velocity up, but you dont want them so small that they restrict. Add in an X-pipe for good measure also...

    Basic formula for carb selection is CID X max RPM / 3456 then mutiply by engine efficiency (ex: 80 percent = .80)
    Last edited by CK7684; 10-14-2009 at 12:34 PM.

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