Which Rocker Arms Do I Have?

Discussion in 'Classic Mustang Specific Tech' started by bodavis100, Aug 28, 2013.


  1. bodavis100

    bodavis100 New Member

    Joined:
    Apr 4, 2011
    Messages:
    24
    Likes Received:
    0
    Trophy Points:
    2
    I am in the process of putting my 351w back together and i do not know if i need to bolt the rocker arms down in a special way. I do not think my heads are stop lock anymore but i do not know. If not do i adjust for valve lash or find tdc on each cyclinder and torque down. This is my first engine so all help is appreciated. The rocker arm has a bolt no stud as picutred

    Attached Files:

    #1
  2. rbohm

    rbohm Founding Member

    Joined:
    Apr 13, 2002
    Messages:
    6,305
    Likes Received:
    253
    Trophy Points:
    124
    Location:
    tucson,az
    you have what are known as pedestal mount rockers. you just install the rockers and the pedestals and torque the bolts to spec. its that simple.
    #2
  3. bodavis100

    bodavis100 New Member

    Joined:
    Apr 4, 2011
    Messages:
    24
    Likes Received:
    0
    Trophy Points:
    2
    Thanks for your reply. Does each piston need to be tdc or can i torque em where they are.
    #3
  4. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

    Joined:
    Nov 30, 1999
    Messages:
    8,308
    Showcase:
    9
    Albums:
    1
    Likes Received:
    1,189
    Trophy Points:
    174
    Location:
    a van down by the river
    yes, each needs to be at tdc when tightening properly
    #4
  5. rbohm

    rbohm Founding Member

    Joined:
    Apr 13, 2002
    Messages:
    6,305
    Likes Received:
    253
    Trophy Points:
    124
    Location:
    tucson,az
    torque them where they are, its all the same in this case. if the arms were adjustable, then i would say set each cylinder at tdc before adjusting the arms.
    #5
    Gearbanger 101 likes this.
  6. Gearbanger 101

    Gearbanger 101 Straight Outta Locash Super Mod

    Joined:
    Aug 11, 2002
    Messages:
    14,272
    Likes Received:
    865
    Trophy Points:
    164
    Location:
    Ontario, Canada
    rbhom is 100% correct. Stamped steel stock rockers just crank down until they bottom out on the shoulder of the nut.

    Aftermarket rockers require each individual rocker to be set while on the base circle of the camshaft (valve at it's most closed position). In which case you tighten them down to approx. 18-22lbs at zero lash. Shims may be required to attain the proper setting in that case.
    Last edited: Aug 29, 2013
    #6
  7. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

    Joined:
    Nov 30, 1999
    Messages:
    8,308
    Showcase:
    9
    Albums:
    1
    Likes Received:
    1,189
    Trophy Points:
    174
    Location:
    a van down by the river
  8. rbohm

    rbohm Founding Member

    Joined:
    Apr 13, 2002
    Messages:
    6,305
    Likes Received:
    253
    Trophy Points:
    124
    Location:
    tucson,az
    #8
  9. madspeed

    madspeed Colonel Mustard Mod Dude Founding Member

    Joined:
    Nov 30, 1999
    Messages:
    8,308
    Showcase:
    9
    Albums:
    1
    Likes Received:
    1,189
    Trophy Points:
    174
    Location:
    a van down by the river
    well done, I missed that detail
    #9
  10. rbohm

    rbohm Founding Member

    Joined:
    Apr 13, 2002
    Messages:
    6,305
    Likes Received:
    253
    Trophy Points:
    124
    Location:
    tucson,az
    actually roller rockers are not that much different either when talking about pedestal mounts. the procedure listed is a left over from adjustable rocker arms from years ago. they even mention doing that procedure with positive stop rocker studs as well, but again all that needs to happen with those is you just bolt down the rocker arms nuts until they bottom out on the stud shoulder.
    #10

Share This Page