Rocker Arm Assembly
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Sealed Power Rocker Arm Assembly

Part No. R-870 Warranty Details  
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Sealed Power Rocker Arms are manufactured to exacting tolerances to work in concert with any valve train.
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Mounting Style:Shaft
Pad Shims Included:No
Retainer Included:Yes
Rocker Arm Body Style:Standard
Rocker Arm Finish:Natural
Self Aligning:Yes

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1 Question | 1 Answer
Displaying question 1
  • Q:

    is there a difference in rockers for exhaust and intake
    Asked on 9/18/2013 by mike from brooksville fl

    1 answer



      With reference to your question, Sealed Power Rocker Arm Assembly -Part No. R-870, Rocker Arms are typically in between the pushrod and the intake and exhaust valves. They allow the pushrods to push up on the rocker arms and therefore push down on the valves. However, in Over Head Cam applications the Cam will ride directly on the Rocker Arm. The rockers in the firing order of the motor using the Exhaust Opening, Intake Closing method (use EOIC as a shorthand memory aid). This method ensures that the lifter of the valve you're adjusting is on the basecircle of the cam when you set the lash. To begin, put all the rockers in place and tighten the nuts or Poly-Loks enough that the arms will open and close the valves as the motor is being turned over. The piston moves downward as the intake valve opens to allow fresh air and fuel into the cylinder. Somewhere around Bottom Dead Center
      (BDC), the intake valve closes. The piston moves up, compresses the mixture and just before Top Dead Center (TDC), the spark plug fires and ignites the mixture resulting in the combustion that pushes the piston down the cylinder. With the piston around BDC, the exhaust valve opens, and as the piston again moves upward, the exhaust valve begins to close. For further assistance regarding the Part No. R-870, please provide the year, make, model and engine size of your vehicle. For more information, please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.

      Answered on 9/19/2013 by Max from AAP
Displaying question 1

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