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Thread: F-head high altitude head?

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  1. #12
    Super Moderator LarrBeard's Avatar
    Join Date
    Nov 2014
    Ft. Wayne, IN

    "70 or so octane"

    " ...back in the day they only had 70 or so octane.."

    Check the octane rating on this overhaul plate from a German Overhaul Depot after WWII.
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