And the Numbers Are??

Discussion in 'High Performance Modifications' started by 1980RS, Dec 7, 2019.

  1. 1980RS

    1980RS Veteran Member

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    Here are the flow Numbers from the somewhat ported Vortec 062 heads

    Intake..................Exhaust
    .100 69 58
    .200 136 101
    .250 171 126
    .300 199 143
    .350 222 156
    .400 240 169
    .450 242 175
    .500 252 183
    .550 249 187
    .600 242 192
    .700 --- 198

    Now the exhaust was flowed with a pipe and the head was flowed with on a 4.060 bore and I was told that because the chamber is cut for a 4.155 bore that on a bench with that opening the numbers would certainly be better. This is with stock GM valves back cut only on the exhaust. I will be putting in new stainless valves as I did not have them at time of testing. So with these heads I should be able to get 500hp from the 406 project. He was most impressed with the exhaust port as I had not done that much other than the short side, guide slimming and complete polish. I am more than happy.
     
    jeff swisher and muscl car like this.
  2. camaro71/holland

    camaro71/holland Veteran Member

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    Very nice, congratulations! Any pictures to show off?
     
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  3. G72Zed

    G72Zed Veteran Member

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    Nice 1980RS, did you use a slightly larger intake valve and/or increase the throat % from OEM.

    If your going to see .500 net lift after deflection, incorporating the "rule of thumb" of 2.057 HP/CFM "potential",your well into the 500hp area.

    That being said, the chart I like to use to see where the HP RPM peak "may" in fact occur based on the volume of 1 cylinder vs cfm states you will be around 5,500 to 5,600 RPM with your 406 CI. I like using this as you can determine approx. TQ peak and set up/gear the car to maximize the engines operating potential.

    Always interested in your testing and track results. Sometimes I have found that the "flow" is not always indicative of the HP potential, but chambers have a big influence on a lot.
     
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  4. 1980RS

    1980RS Veteran Member

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    Thanks, Pictures are in post #1062 in the Vortec thread.
     
    Last edited: Dec 8, 2019
  5. 1980RS

    1980RS Veteran Member

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    The valves were stock GM valves and I have been told that the aftermarket stuff can flow a little more. Also the port next to the outside ports on the Vortec's flow better than the outer ports, that's where you see the 230ish numbers in the magazines and then the 220ish on other threads on line. Found this out from a head porter and his take on it was the layout might be like a BBC long and short port deal. Who knows, but I will be going to another place that want's to flow them for me (circle track guys) so I will get my chance he a second time and they are going to flow both the outer and middle ports. I do like the low and mid lift numbers on this head and if the engine will make 500hp I would be happy as it should put the car in the high 10's, that the goal here, stock set test first though.
     
  6. G72Zed

    G72Zed Veteran Member

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    Some valve shapes are complimentary to the port, some you think would be better but do not, it needs to be tried out, plus playing with back cuts. If you have the chance, get your intake and a gasket and flow the both runners with the intake bolted one, you may find less port to port CFM variation.
     
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  7. 1980RS

    1980RS Veteran Member

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    I can bet with a dual plane intake bolted up you will see a huge variation in flow numbers from port to port. This guy stated that if I were to add a back cut on the intake it would make the port to busy as in too much velocity and my cause problems as it flowed so well without the extra cut.
     
  8. G72Zed

    G72Zed Veteran Member

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    I actually did a R&D test with an open vs dual plane on the bench, with spacer/carb used, bolted to the head.

    I was blown away that the "high & low" ports of the dual plane flowed within 1 CFM of each other, very well balanced out actually. This was also done with both plenums being 100% divided.
     
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  9. 1980RS

    1980RS Veteran Member

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    Would have never though that would happen. Maybe that's why the RPM intake pulls so well on the top end.
     
  10. G72Zed

    G72Zed Veteran Member

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    It was actually the Weiand Speed Warrior that tested so well on the bench.

    But the RPM Air Gap worked real well also, gave me a dual HP peak 6,900 and 7,200 and spread the Peaks to 2,400 RPM.
     

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