2001 Northstar piston to rod orientation?
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Northstar Engines and System Technical Discussion Discussion, 2001 Northstar piston to rod orientation? in Cadillac Engine Technical Discussion; Is the wrist pin hole offset on these pistons or are they reversible? any input would be appreciated. thanks...
  1. #1
    oberlandervette is offline Cadillac Owners Member
    Automobile(s): 2001 STS
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    2001 Northstar piston to rod orientation?

    Is the wrist pin hole offset on these pistons or are they reversible? any input would be appreciated.
    thanks

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  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
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    Re: 2001 Northstar piston to rod orientation?

    The pistons and rods are orientation specific. Each has locator arrows stamped/etched into the rod/piston crown. Diagrams in the GM service manual. Several posted in the overhaul thread by daveyhouse, as well as the ring orientation.

  4. #3
    oberlandervette is offline Cadillac Owners Member
    Automobile(s): 2001 STS
    Join Date
    Mar 2013
    Location
    Medina ohio
    Posts
    11

    Re: 2001 Northstar piston to rod orientation?

    I marked mine when i took them out but the pistons were reversed from bank to bank. there is what looks like a drain back traugh on the piston at bottom of pin hole. one side points towards center of block and the other side points out. ill get on GM SI and dig deeper.

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