Help - low comp bbc cam choice

Discussion in 'Engine Topic' started by moncam, Jun 30, 2020 at 11:50 AM.

  1. moncam

    moncam New Member

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    Hi all,

    I have a 1971 402 big block with 820 heads. Came from the factory with 8.5:1 compression. I have since added a weiand 8123 low rise dual plane (idle to 5500rpm), 750 holley, msd pro billet distributor and 6-al, 1 3/4 headers.

    The heads flow:
    71/52 at .100
    145/105 at .200
    227/144 at .300
    260/176 at .400
    279/190 at .500

    My searches for a hydraulic FT cams has so far come up with Lunati Voodoo 10110701 .515"/.530" lift 213/219 at 050 duration 112 lsa basic operating RPM range:1,000-5,500

    Im after plenty of torque and as much hp as possible as it is a 90% street car 10% strip. Is this a good cam considering my low comp? Do any of y'all have better recommendations?
     
    1980RS likes this.
  2. G72Zed

    G72Zed Veteran Member

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    I like the Voodoo line of cams, accurate, makes the power they should and not "noisy" like some other popular grinds beating up your valvetrain. The late UD Harold was the designer of those lobes in the Voodoo line.

    Looking at your application, and the 2 other "step ups" from yours, the next one is a 1,400 to 5,800 rpm range, and then the last one is 1,800-6,200 but likes more converter and may in fact require more SCR. Unfortunately they do not give a min-max CR recommendation or requirement.

    I would call Lunati to see what the trade off is with your combo and current cam choice and see if the one up #10110702 could be use instead.

    To low of a CR for the cam kills TQ/throttle response and mpg real quick.
     
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  3. 1980RS

    1980RS Veteran Member

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    Best Hyd. BBC cams I have ever used were the old HMV Crane cams. The HMV 272 was .525 intake and .510 exhaust lift, 218° and 228° on a 114 LCA. Pulled really good up to about 5600. The 278 cam is bigger but needs a little more Compression. Also the 2 Summit 1302 and 1303 cams are good and dirt cheap. I did try the 1303 last year and ran great in my low comp 461.
     
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  4. moncam

    moncam New Member

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    @G72Zed thanks for the help. I also would have found it helpful if lunati had recommended a SC with that particular cam. Calling them up direct is the best option

    @1980RS thanks for you advice
     
  5. 1980RS

    1980RS Veteran Member

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    You are welcome. :D
     
  6. G72Zed

    G72Zed Veteran Member

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    Your welcome, let us know what Lunati says.
     
  7. 450bench

    450bench Veteran Member

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    Crane cam - part number 103072

    Great cam for a low compression big block. A little tighter lobe separation helps a bit with cylinder pressure.
    Used a ton of these over the years.
    You can run a stock converter as well.
     

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