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  1. #1
    Join Date
    May 2006
    Location
    Smack in the middle of Hollywood, CA
    Posts
    635

    Default 350 Head flow numbers

    I'm having a carb built and want to give the the flow numbers.
    69 350 pocket ported
    i also need to find the CR

    69 Skylark
    470-BBB
    2004r- 3500 stall 9.5" lock-up
    3.73 12-bolt
    3900 lbs.


    Dave Benisek+Bruce Kent
    2010 GS Nationals video
    http://youtu.be/nLD4Dugcv48

  2. #2
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    14,893

    Default Re: 350 Head flow numbers

    Quote Originally Posted by flatire View Post
    I'm having a carb built and want to give the the flow numbers.
    69 350 pocket ported
    i also need to find the CR
    I know you don't want to hear this, but you'll have to find someone with a flow bench. There's variation just based on the valve seat, not to mention port work.

    You'll have to calculate static compression ratio based on the volume measurements from the parts you're using.

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  3. #3
    Join Date
    May 2006
    Location
    Smack in the middle of Hollywood, CA
    Posts
    635

    Default Re: 350 Head flow numbers

    Quote Originally Posted by DaWildcat View Post
    I know you don't want to hear this, but you'll have to find someone with a flow bench. There's variation just based on the valve seat, not to mention port work.

    You'll have to calculate static compression ratio based on the volume measurements from the parts you're using.

    Devon
    do you know stock numbers?
    69 Skylark
    470-BBB
    2004r- 3500 stall 9.5" lock-up
    3.73 12-bolt
    3900 lbs.


    Dave Benisek+Bruce Kent
    2010 GS Nationals video
    http://youtu.be/nLD4Dugcv48

  4. #4
    Join Date
    Sep 2004
    Location
    Michigan, USA
    Posts
    14,893

    Default Re: 350 Head flow numbers

    Sorry, I don't. Call Greg Gessler, he's an excellent source for answers to questions like this.

    Gessler Head Porting
    25 Four Corners Road
    Blairstown, New Jersey 07825-2402

    (908) 362-7692
    Monday - Friday 9am - 5pm EST

    Devon
    Fuel & Brake Systems Engineer
    "I can live with doubt and uncertainty and not knowing. I think it's much more interesting to live not knowing than to have answers which might be wrong." - Feynman
    "Good data is precious. The problem I have is when some damned fool fails to use it properly." - Slingerland

  5. #5
    Join Date
    Feb 2002
    Location
    Oakland Gardens, N.Y.
    Posts
    20,868

    Default Re: 350 Head flow numbers

    You don't need flow numbers to have a carburetor built. Vacuum at idle is more important. Tell the builder as much as you can about your combination.
    Larry
    1998 "Fully Optioned" SC3800 Riviera
    70 GS 455 Stage1, TSP 470, 602 HP@ 5900, 589 TQ @ 4900
    TA Hyd Roller Cam, 230*/238*, 112, .544"/.577" lift, 4-7 swap
    MSD Digital 6+, Ignitionman Distributor w/MSD trigger
    1967 BT Switchpitch ST-400, Gear Vendors OD
    with TSP 3200/1800 converter
    AED 1000 HO Carb, 800 CFM 7042240 Quadrajet
    8.5 10 bolt, 3.73's
    11.67 @ 115.49 MPH
    Larrymta@verizon.net, GSCA #291
    BPG # 1063
    N.E. GS/GN Club Assistant Director

  6. #6
    Join Date
    Mar 2004
    Location
    Edmonton Alberta
    Posts
    13,377

    Default Re: 350 Head flow numbers

    Just for an example....Here are some flow numbers for both a stock and ported head:

    Stock Flow, stock valve...
    intake
    .050 - 27
    .100 - 55
    .200 - 112
    .300 - 165
    .400 - 199
    .500 - 196
    .600 - 199
    exhaust
    .050 - 22
    .100 - 44
    .200 - 87
    .300 - 119
    .400 - 137
    .500 - 146
    .600 - 149

    Ported, 1.92/1.55 valves
    Intake
    .050 - 32
    .100 - 60
    .200 - 116
    .300 - 172
    .400 - 215
    .500 - 247
    .600 - 262
    exhaust
    .050 - 27
    .100 - 53
    .200 - 102
    .300 - 145
    .400 - 175
    .500 - 177
    .600 - 182
    __________________________________________________ ________________________________________
    My book called Small Block Buick Performance covering the V6, 215, 300, 340, and Buick 350 engines will be released soon.

    http://www.v8buick.com/forumdisplay....rformance-Book
    __________________________________________________ __________________________________________________ _________________________________
    1970 Buick Skylark 350 street/strip with 6 point cage: Custom tube headers feed Twin T3/T4 Turbochargers, Holley 650, sheet metal single plane intake, heavily ported iron heads with oversized valves, mild Poston 114 camshaft (2800-6000 RPM), Diamond forged pistons on Hershe forged rods, balanced, ARP everywhere, dual 3" exhaust, Paddle shifted 4L80E 4 speed overdrive, Moser 12 bolt with 3.42 gear.

 

 

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