{"product_id":"s-s-129-big-bore-kit-black-cylinders-highlighted-fins","title":"S\u0026S, 129\" big bore kit. Black cylinders \/ highlighted fins","description":"2102cc kit. Converts the 107\" engine to 129\". Largest possible 4.320\" bore bolt-in big bore kit. Stroker flywheels not required. Works with stock crankcases; case boring is not required; stock flywheels; stock heads and retains stock engine height. Kit includes a forged 4.320\" big bore piston kit; black wrinkle powder coated 4.320\" big bore cylinders; 2 MLS (Multi-Layer-Steel) .030\" head gaskets; 2 cylinder base gaskets; 4 cylinder dowels and an S\u0026amp;S cubic inch cam cover batch. Black powder coated finish to match OEM finish. Note: For the 132\" kit (to convert 114\" engines) S\u0026amp;S measured 135.51HP and 145.83TQ with stock heads; a 550 cam; stock throttle body and a high flow Stealth air cleaner kit. Note: Tuning of fuel injection and ignition may be required. Note: S\u0026amp;S advises 576972 S\u0026amp;S head bolt kit for all big bore applications.\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e 17-24 M8 with 107\" engine (NU)\u003c\/p\u003e","brand":"S\u0026S","offers":[{"title":"Default Title","offer_id":54307648602439,"sku":"974960","price":2009.05,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0987\/7812\/0519\/files\/974960k.jpg?v=1784469194","url":"https:\/\/www.chopperessentials.com\/products\/s-s-129-big-bore-kit-black-cylinders-highlighted-fins","provider":"Chopper Essentials Co.","version":"1.0","type":"link"}