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Thread: 258 pistons in a 290

  1. #1
    Bulltear forum member New to the forum
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    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
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    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.

    Bob
    tufcj
    1969 AMX
    1967 Rambler Rogue

    If you need a tool and don't buy it...
    you'll eventually pay for it...
    and not have it.
    Henry Ford

  3. #3
    Bulltear forum member New to the forum
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    Quote Originally Posted by tufcj View Post
    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.

    Bob
    tufcj
    Piston compression height matters most.

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