Timing For 400

Engine & Related

  1. Rstockbridge

    Rstockbridge New Member

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    Does anyone know what the timing should be for a 400 with a 727 auto, headers aluminum intake and cam with the following specs:

    Cam Style:Hydraulic flat tappet

    Basic Operating RPM Range:2,000-5,800

    Intake Duration at 050 inch Lift:227

    Exhaust Duration at 050 inch Lift:241

    Duration at 050 inch Lift:227 int./241 exh.

    Advertised Intake Duration:279

    Advertised Exhaust Duration:296

    Advertised Duration:279 int./296 exh.

    Intake Valve Lift with Factory Rocker Arm Ratio:0.486 in.

    Exhaust Valve Lift with Factory Rocker Arm Ratio:0.473 in.

    Valve Lift with Factory Rocker Arm Ratio:0.486 int./0.473 exh.

    Lobe Separation (degrees):107

    Camshaft Gear Attachment:1-bolt

    Computer-Controlled Compatible:No
     
  2. Coyote

    Coyote Well-Known Member

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    I’d go with about 30 degrees total (combination of initial, vacuum, centrifugal) to start with. Conservative, you’ll probably end up about 34-36 after tweaking for best performance. Good luck!:thumbsup::beep:
     
  3. Coyote

    Coyote Well-Known Member

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    Above was suggested for ignition timing. If you want cam timing, I’d go with straight up unless you are going to degree it in.

    Most aftermarket cams are ground with some advance to start with.:beep:
     
  4. dmartin

    dmartin Well-Known Member

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    Are you from Ga
     
  5. Rstockbridge

    Rstockbridge New Member

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    No - Texas
     
  6. dmartin

    dmartin Well-Known Member

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    Ok gotcha
     

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