Please note: This piston fits many rod/stroke combinations.  The high wrist pin location allows maximum rod length for whichever stroke is used.  We recommend you  review our crank selections first (even if you own one) and look at the 'related products' to see which piston/rod combos it fits.  This version fits iron heads and non-Arca aluminum heads, is a 3 ring design and requires additional .875" wrist pins.