{"product_id":"s-s-cycle-stock-1-750-diameter-valve-1936-47-ohv-bt-kn-series-seat-intake-exhaust","title":"S\u0026S Cycle 2007+ BT 3.937in x 4-3\/8in Piston Set","description":"These big bore pistons work with the stock 4-3\/8\" stroke flywheels to convert any 2007-'16 HD® big twin engine from 96\" or 103\" to 107\" displacement with 10.4:1 compression with stock heads. Stock cylinders may be bored to accomodate larger pistons, but we recommend S\u0026amp;S 3.927\" bore cylinders which feature high strength alloyed cast iron liners. Pistons are compatible with stock rods with tapered wristpin ends. S\u0026amp;S® 3.927\" bore pistons are machined to such close tolerances that it is not necessary to measure the piston. Just bore cylinders to nominal diameter +\/- 0.0005\" for correct clearance. Additionally, the low friction coating on the piston skirt makes taking measurements very difficult. 3.937\" standard bore.","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44401095803054,"sku":"SSC920-0100","price":514.95,"currency_code":"USD","in_stock":false}],"url":"https:\/\/purauto.com\/products\/s-s-cycle-stock-1-750-diameter-valve-1936-47-ohv-bt-kn-series-seat-intake-exhaust","provider":"PurAuto","version":"1.0","type":"link"}