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Thread: 258 pistons in a 290

  1. #1
    Bulltear forum member New to the forum
    Join Date
    Dec 2018

    258 pistons in a 290

    Anyone ever tried using 258 pistons in a 290? or even trying it with a 304 crank?

  2. #2
    Thank you from BT ULTIMUS MAXIMUS STATUS tufcj's Avatar
    Join Date
    Apr 2004
    Watkins, CO
    I've heard the 258 pistons are the same as 304. The problem is finding someone willing to break a set to get you the 2 extras. Time and cost considered, you might as well just get a custom set of 290 pistons. The 304 crank gives you .16" more stroke (3.44 vs 3.28 ), so the pistons may be above the deck. You'd have to do calculations based on crank, rod, and piston compression height you're using.

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