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SBC timing chain question

Discussion in 'The Hokey Ass Message Board' started by Hot Rod Chris, Apr 1, 2011.

  1. Hot Rod Chris
    Joined: Mar 31, 2011
    Posts: 464

    Hot Rod Chris
    Member

    SO I just ordered my new cam for my 54, and bought my timing chain as well. I got a double roller chain but notice it had adaptability 4+/- on the crank sprocket so I can use -4 degrees, stock, or +4degrees. My question is which setting would be best to use? Im running a pretty much stock SBC with just bolt ons (intake, carb, spacer, cap/rotor, coil, wires and headers) and no other internal work. Here are the specs on the cam:
    <table class="overvw"><tbody><tr><td class="overvw-labels">Intake Duration at 050 inch Lift</td><td class="overvw-midmargin">
    </td><td class="overvw-data">214</td></tr><tr><td class="overvw-labels">Exhaust Duration at 050 inch Lift</td><td class="overvw-midmargin">
    </td><td class="overvw-data">224</td></tr><tr><td class="overvw-labels">Duration at 050 inch Lift</td><td class="overvw-midmargin">
    </td><td class="overvw-data">214 int./224 exh.</td></tr><tr><td class="overvw-labels">Advertised Intake Duration</td><td class="overvw-midmargin">
    </td><td class="overvw-data">272</td></tr><tr><td class="overvw-labels">Advertised Exhaust Duration</td><td class="overvw-midmargin">
    </td><td class="overvw-data">282</td></tr><tr><td class="overvw-labels">Advertised Duration</td><td class="overvw-midmargin">
    </td><td class="overvw-data">272 int./282 exh.</td></tr><tr><td class="overvw-labels">Intake Valve Lift with Factory Rocker Arm Ratio</td><td class="overvw-midmargin">
    </td><td class="overvw-data">0.442 in.</td></tr><tr><td class="overvw-labels">Exhaust Valve Lift with Factory Rocker Arm Ratio</td><td class="overvw-midmargin">
    </td><td class="overvw-data">0.465 in.</td></tr><tr><td class="overvw-labels">Valve Lift with Factory Rocker Arm Ratio</td><td class="overvw-midmargin">
    </td><td class="overvw-data">0.442 int./0.465 exh.</td></tr><tr><td class="overvw-labels">Lobe Separation (degrees)</td><td class="overvw-midmargin">
    </td><td class="overvw-data">112</td></tr></tbody></table>
    Which would be best?
     
  2. JoelH
    Joined: Jan 6, 2010
    Posts: 8

    JoelH
    Member

    the degrees are for "degreeing in the cam" google it and it will show you how to get perfect cam timing
     
  3. Deuces
    Joined: Nov 3, 2009
    Posts: 25,554

    Deuces

    Check out crane and comp cams... They'll show you how it's done. I use a mag base with a 0-1.00" travel dial indicator, a pro 18" dia. degree wheel and a bolt on adjustable pointer..
     
  4. Most of the time if you run a cam advanced it will give you more lower end torque.
    With a mild cam you might want to stick with 0 (stock).
     
  5. newsomtravis
    Joined: Jun 1, 2009
    Posts: 562

    newsomtravis
    Member
    from pville, ca

    just like rick said, advance 4 degrees more low end, but with a fairly stock motor, i wouldn`t bother wasting the time to dregree it or bother to figure out to advance, retard it, just set it straight up and go........
     
  6. straight up and go X2
     
  7. Your cam is pretty mild really in the big view, so just install it straight up at 0. Advanced is good for bigger cams and lower compression to get more low end. Retarded helps top end. You do not need more low end, or top end. Just straight up is good. Advanced can make valve clearance a bit tighter, but with your lift and stock pistons, not an issue.

    You can install advanced if you want, it won't really hurt and will give a bit more low end. But your cam does not really need it.
     
  8. R Pope
    Joined: Jan 23, 2006
    Posts: 3,309

    R Pope
    Member

    One more vote for straight up.
     
  9. Hot Rod Chris
    Joined: Mar 31, 2011
    Posts: 464

    Hot Rod Chris
    Member

    The people have spoken, straight up it is.. Thanks everyone!
     
  10. Run it straight up. You'll end up with a good running motor, good vacuum for great drivability (good mileage) with plenty of torque. Keep your timing set at around 10-12" initial with 36 degees total at 2,200/ 2,400 rpm.
     

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