Solid flattappet or hyd roller...

Discussion in 'High Performance Modifications' started by CAMLT74, Sep 24, 2017.

  1. 2ndGenCrazy

    2ndGenCrazy Veteran Member

    549
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    Aug 18, 2011
    Upstate New York
    I would recommend performer rpm air gap and 1 3/4" header to start. Heads flow 250 @ .500" according to Edelbrock. Cam is on the money as long as you are using oil with proper additives. I would change only those things and tune ignition curve carb to see if first 330' can be improved. This car should 60' in the 1.60 range. I am also assuming that this is a street car. I owned a very similar car that ran 11.60's at 116 open and 11.80 @ 113 closed exhaust at 500 ft. altitude in fair air. I have dynoed and raced these types of combos many times. The dual plane will not hurt the top end of this engine at all, and will help hit the converter harder on the launch. JMHO of course. I am fairly certain many will disagree with me.
     
  2. CAMLT74

    CAMLT74 Veteran Member

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    Sep 27, 2008
    Fredericia, Denmark
    Yes this is a street car that weighs 3800 lbs with me and gas.

    I have actually had RPM airgap before this plenum ported Super Victor manifold.
    Torque with airgap at 3100 rpm where converter stalls was 435 and with Victor it is 501 and stays between 65 and 80 more nearly all the way up to shifting point at about 6000 rpm. HP with airgap where 373 and 410 with Victor. When we dynoed with Victor it had a partly loose wire connection to the ignition coil and this caused the engine to max out already at 5200 rpm. You Can actually hear it in the 2. Youtube link in my sig. With airgap manifold it maxed at 5900. So in real life i expect 25 more HP vith Victor.

    In two comparable runs with only difference being airgap/victor and new body mounts it ran like this.
    Best run with airgap was 1.862 60', 7.859@85.4
    Best run with victor was 1.856 60', 7.874@90.68

    So nearly exatly same 60' and ET but way better MPH with Victor.

    Since then I have changed tires from MT ET Street to MT ET Street R and 1.6 ratio lifters at intake valves and mechanic to electric radiator fan.
     
    Last edited: Sep 26, 2017
  3. 2ndGenCrazy

    2ndGenCrazy Veteran Member

    549
    4
    Aug 18, 2011
    Upstate New York
    Surprising result. Did you dyno with the 1 5/8" primary headers?
     
  4. CAMLT74

    CAMLT74 Veteran Member

    101
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    Sep 27, 2008
    Fredericia, Denmark
    Yes same headers and at the same dyno...
     
  5. CAMLT74

    CAMLT74 Veteran Member

    101
    0
    Sep 27, 2008
    Fredericia, Denmark
    Maybe the std Victor manifold doesn't flow quite good enough for many of our engine combinations causing bad results, but mine being plenum ported and keeping the same size runners is a good solution. If I remember correct it now flow about 310 cfm in average.
     
    Last edited: Sep 26, 2017
  6. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

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    Mar 25, 1999
    San Jose, CA, USA
  7. 76z28

    76z28 Veteran Member

    1,696
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    Jun 29, 2009
    bakersfield
    I wouldn't mind going hyraulic roller in my set up.. But my flat tappet cam has never failed met.. yet.
    I don't think I would run any faster with a roller either.
     
  8. 2ndGenCrazy

    2ndGenCrazy Veteran Member

    549
    4
    Aug 18, 2011
    Upstate New York
    Mine was a Victor Jr. which is an older design. The Super Victor is much better. I would like to try the same test again based on your results. Thanks for sharing.
     
  9. CAMLT74

    CAMLT74 Veteran Member

    101
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    Sep 27, 2008
    Fredericia, Denmark
    www.ppmracing.se who did the porting, told me that the manifold should flow at least 10% and preferably 20% more than the cyl heads. I think some people tend to focus more on the cylinder heads, and forget about the manifold flow ratings. RPM airgap only flows 253 average, std. Super Victor 295 average (280-308), Super Victor stage 1 ported (mine) 325 average (305-334). The Victor Jr. flows 285 average with some more porting that I got in the Super Victor, I don't know what it flows std... I even managed to squeeze Super Victor under my stock hood.
     
    Last edited: Sep 27, 2017
  10. 2ndGenCrazy

    2ndGenCrazy Veteran Member

    549
    4
    Aug 18, 2011
    Upstate New York
    It would be interesting to flow a head with manifold attached and use some velocity probes to look at air speed. In the old days, you would lose torque in mid range. Obviously you did not suffer a torque loss in your application. Thanks again for sharing your info.
     

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