{"product_id":"arco-57-mbk450-starter-mounting-bolt-kit-gear-reduction-marine","title":"ARCO 57-MBK450 Starter Mounting Bolt Kit – Gear Reduction Marine Starters","description":"\u003ch2\u003eARCO 57-MBK450 Starter Mounting Bolt Kit\u003c\/h2\u003e\u003cp\u003eComplete your gear reduction starter swap with the right hardware. The ARCO 57-MBK450 includes two long 3\/8–16 N.C. thread mounting bolts specifically sized for installing gear reduction starters on marine inboard and stern-drive engines. Using the correct mounting hardware ensures a secure, properly aligned installation that protects both the starter and the engine block.\u003c\/p\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eARCO gear reduction starters with staggered bolt mounting pattern\u003c\/li\u003e\n\u003cli\u003eDelco gear reduction starters with staggered bolt mounting pattern\u003c\/li\u003e\n\u003cli\u003eMarine inboard and stern-drive engines with 3\/8–16 N.C. thread starter mounting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot compatible:\u003c\/strong\u003e metric-threaded engine blocks or 10MT-style starters\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eIncludes: 2 long mounting bolts\u003c\/li\u003e\n\u003cli\u003eThread: 3\/8–16 N.C. (National Coarse)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThis kit is essential when upgrading from an older 10MT-style starter to a modern gear reduction unit. Gear reduction starters use a different bolt spacing and length than 10MT starters — the factory bolts from the old unit will not work, and attempting to reuse them risks a misaligned or insecure installation. Confirm your engine block uses standard N.C. thread before ordering; metric-threaded blocks require different hardware. If you also need a solenoid for your gear reduction starter installation, see the \u003ca href=\"\/products\/11141379293220\"\u003eARCO SW450 Starter Solenoid for MerCruiser, Cobra \u0026amp; Volvo Penta\u003c\/a\u003e or the \u003ca href=\"\/products\/11141379358756\"\u003eARCO SW463 Heavy-Duty Starter Solenoid for MerCruiser, OMC \u0026amp; Volvo Penta\u003c\/a\u003e.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250828640292,"sku":"57-MBK450","price":47.09,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/57-MBK450.jpg?v=1786510776","url":"https:\/\/marisolmarine.com\/products\/arco-57-mbk450-starter-mounting-bolt-kit-gear-reduction-marine","provider":"Marisol Marine Company","version":"1.0","type":"link"}