{"product_id":"s-s-cycle-106-3688","title":"S\u0026S Cycle 99-06 BT 3.927in Standard Bore 97in Big Bore Forged Piston Set","description":"\u003cp\u003eThese big bore pistons work with the stock 4\" stroke flywheels to convert any 1999-'06 HD® big twin engine from 88\" to 97\" displacement with 9.7:1 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. 3.927\" standard bore.\u003c\/p\u003e\u003cp\u003eGenuine S\u0026amp;S Cycle. Part number 106-3688.\u003c\/p\u003e\u003cp\u003eImported to order from our US supply partner — allow 7-14 days delivery.\u003c\/p\u003e","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":65722361446749,"sku":"106-3688","price":469.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1069\/0009\/5325\/files\/09437b2ab5757bf75d6822587fb72aa4L.jpg?v=1787919201","url":"https:\/\/performancepartsdirect.co.uk\/products\/s-s-cycle-106-3688","provider":"Performance Parts Direct","version":"1.0","type":"link"}