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  1. #1
    Join Date
    Nov 2005
    Location
    Montreal, Quebec, Canada
    Posts
    161

    Default stock 350 head flow numbers

    Anyone have flow numbers for a stock 1970 350 head?
    casting 1233472
    Shane

    ---------------------------
    1970 Buick Lesabre

  2. #2
    Join Date
    May 2002
    Location
    Fayetteville,N.C.
    Posts
    1,308

    Default Re: stock 350 head flow numbers

    I am flowing that exact stock casting today. I should have some numbers posted this evening if all goes well.
    Nitrous is just a "poor-man's blower" on a payment plan.
    Rick Crawford
    72 GS w/Nitrous'd 466
    8.96 @133
    5.50 @129.5 1/8mi, 1.36 60ft
    2009 Pontiac G8 GT 10.87 @127 full street trim, 285/40-18 drag radials

  3. #3
    Join Date
    Nov 2005
    Location
    Montreal, Quebec, Canada
    Posts
    161

    Default Re: stock 350 head flow numbers

    Cool, thanks!
    Shane

    ---------------------------
    1970 Buick Lesabre

  4. #4
    Join Date
    May 2002
    Location
    Fayetteville,N.C.
    Posts
    1,308

    Default Re: stock 350 head flow numbers

    Things got busy and they didn't get flowed but it will be soon. They will be posted soon.
    Nitrous is just a "poor-man's blower" on a payment plan.
    Rick Crawford
    72 GS w/Nitrous'd 466
    8.96 @133
    5.50 @129.5 1/8mi, 1.36 60ft
    2009 Pontiac G8 GT 10.87 @127 full street trim, 285/40-18 drag radials

  5. #5
    Join Date
    Mar 2004
    Location
    Edmonton Alberta
    Posts
    13,382

    Default Re: stock 350 head flow numbers

    Quote Originally Posted by Buicks4Speed View Post
    I am flowing that exact stock casting today. I should have some numbers posted this evening if all goes well.
    If all flows well hahah!
    __________________________________________________ ________________________________________
    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.

  6. #6
    Join Date
    Jun 2004
    Location
    ontario, canada
    Posts
    172

    Default Re: stock 350 head flow numbers

    lol good one. I'm really interested in this, and i'll see what i can do soon to see what a set of good valves and a really nice valve job can do, along with a little blending.
    Yeroon Van Leeuwen
    1969 Skylark - 5.3 Engine/th400.

  7. #7
    Join Date
    Jul 2002
    Location
    Long Island, NY
    Posts
    2,012

    Default Re: stock 350 head flow numbers

    Hi guys. Been a while since I've benn on the board. Quite a bit going on.
    I'll take a educated guess at this question.
    With 1.88 and 1.55 valves on a 1970 head the numbers should be about 238 on the intake and 162 on the exhaust at 28" H2O.
    Rick,
    Looking at the pictures. Nice job on the heads. Runners and guides are done well. Short turns look to be very close. Bowls may need just a little more.
    From the pictures I'm going to guess 260/180.

    It's all in the bowl!!
    Bill

  8. #8
    Join Date
    Feb 2002
    Location
    Upstate NY 13901
    Posts
    5,821

    Default Re: stock 350 head flow numbers

    Those stock numbers are very close to the stock Vortec 350" SBC head. Being that's the best flowing iron SBC head to be mass produced, I'd say that's decent company.
    Scott B.


    72 GS 455 Stage 1, 70 Skylark, 92 Roadmaster

    Acts 4:12 - Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved.

  9. #9
    Join Date
    Jun 2004
    Location
    ontario, canada
    Posts
    172

    Default Re: stock 350 head flow numbers

    actually they flow better then stock vortecs by about 15 cfm each side. It takes 2.02/1.60's to match these, and a fully ported set of vortecs can reach 275 ish if you have a really good porter. lol 30 years and they still haven't made a stock sbc head that is equal.
    Yeroon Van Leeuwen
    1969 Skylark - 5.3 Engine/th400.

  10. #10
    Join Date
    May 2002
    Location
    Fayetteville,N.C.
    Posts
    1,308

    Default Re: stock 350 head flow numbers

    Bill,
    The problem is I have hit water twice in the bowls so I am a bit skidish with them since it usually the last port that shows a water jacket.
    BUT I have been working with the 472 casting which is the pre-72 style that have a little different port than the 72 and up. I think the 72 has a better port to work with but since I can't seem to get past 262 on the intake on the bench, I am a bit puzzled. I haven't messed with the roof or the back side of the bowl so that is the only place left for me to look into. I just don't see there being much, if any, flow there. Half of the port in the back side of the bowl is at the seat already....

    Maybe since you are 30cfm better stock on the same casting, they may be 30cfm better ported???? This is why I flowed a stock head for reference.

    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 vlaves
    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

    I have gotten 190 on the exhaust by laying back the short turn more but it cost me a ton from .100-.500. losing as much as 25 cfm at .400.
    Nitrous is just a "poor-man's blower" on a payment plan.
    Rick Crawford
    72 GS w/Nitrous'd 466
    8.96 @133
    5.50 @129.5 1/8mi, 1.36 60ft
    2009 Pontiac G8 GT 10.87 @127 full street trim, 285/40-18 drag radials

  11. #11
    Join Date
    Mar 2002
    Location
    Southern, MD
    Posts
    137

    Default Re: stock 350 head flow numbers

    Bill,
    We have used your flow numbers from your ported heads as a bench mark or goal, but we have not been able to get the numbers. Rick has used a couple of test heads working different aspects of the port trying to find the flow. Just to besure that he is getting the most accurate data we have used two seperate flow benchs at different machine shops. We have not been off by more than a couple of numbers between the two benches. If you could double check your flow sheet for your stock heads just to confirm the data, because 238 seem to be a bit high for a stock SBB head and is way off from our numbers, if the bench that flowed your heads was off by 30 numbers than maybe that's why we are off on the ported heads too.. Like Rick said he is going to start working on a later casting to see if there is more meat to work with.
    Last edited by bad-buford; 02-08-2007 at 05:40 PM. Reason: added information
    Cory Ackley

    1993 Ford Lightning
    2004 Ford Lightning

  12. #12
    Join Date
    Jul 2002
    Location
    Long Island, NY
    Posts
    2,012

    Default Re: stock 350 head flow numbers

    Quote Originally Posted by bad-buford View Post
    Bill,
    If you could double check your flow sheet for your stock heads just to confirm the data, because 238 seem to be a bit high for a stock SBB head and is way off from our numbers, if the bench that flowed your heads was off by 30 numbers than maybe that's why we are off on the ported heads too..
    Cory,
    I'm sorry. Those numbers I threw out were just a guess not actual bench numbers. We never flowed the stock heads. I am a little surprised the numbers Rick is getting for stock is kinda low. Thought they would be much higher.
    Nice comparison between the different heads. Thanks.
    Bill

 

 

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