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Forged piston to wall clearance

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  • Forged piston to wall clearance

    Hello. I´m about to hone my cylinders and was thinking how much I should do.
    I´ve read somewhere that forged pistons should have a looser fit than the standard ones.
    My pistons are SpeedPro forged .030.
    BTW. Alex, It went really smooth weighing the rodends with some slick oil on the tools.Thank you.
    -65 Mustang 289" Floo-Tek heads Comp sft. 8" Jpt 5000 stall. Strange 9" 4.57

  • #2
    .006 if the pistons are coated.
    .007 to .008 if they are not.

    Alex Denysenko

    NHRA/IHRA/NMCA member and licensed Superstock driver
    NHRA and IHRA SS/LA & SS/MA National Record Holder 99','00,'01,'02,'03,'04,'05 & '06
    First NHRA & IHRA 289 automatic Superstock Mustang in the TENS 06-99
    First SS/MA in the TENS 04-03
    5 time IHRA division 5 Superstock Champion
    Fleet of FoMoCo products including 88 ASC McLaren Mustang #28

    The Barry of BarrysGrrl

    Quote #1: "I never met a magazine mechanic I liked."
    Quote #2: "Make sure brain is in gear before engaging mouth!"
    Quote #3: "If you can't run with the big dogs, stay on the porch!"
    Quote #4: "Go fast or go home!"
    Quote#5:" No Brag,Just Fact!"


    • #3
      Thanks Alex.
      The sides of the pistons have that grey-black coating on them so I will hone them as you describe.

      -65 Mustang 289" Floo-Tek heads Comp sft. 8" Jpt 5000 stall. Strange 9" 4.57