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mercury 7.5 , 7391A3 / 7391T3 pistons

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  • mercury 7.5 , 7391A3 / 7391T3 pistons

    I have a 1979 7.5 mercury OB . the pistons in the motor have 2 rings on them. I notice the mercury replaced them with a 3 ring piston type. There are still some old stock 2 ring pistons around or should I replace them with 3 ring type.
    7391A3 vrs 7391T3 pistons . thanks for the input Jb

  • #2
    Either will work

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    • #3
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      Actually the older motors had 3 rings on the piston and newer ones had 2 rings.

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