{"product_id":"b48-billet-main-caps-by-5150-autosport","title":"B48 Billet Main Caps by 5150 AutoSport","description":"\u003ch1\u003e\u003cspan\u003e5150 AutoSport B48 Billet Main Caps\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAs B48 builds continue to push beyond \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e900+ WHP\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, we've seen the limitations of the factory main caps under extreme cylinder pressure and crankshaft loads. Even the slightest main cap movement can affect main bearing alignment, oil clearance, and ultimately the reliability of your engine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eOur \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eCNC-machined billet steel main caps\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e are heat treated for maximum strength and feature a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edowel-pinned design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e that positively locates each cap, virtually eliminating cap movement under extreme horsepower and high-RPM operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eBenefits of 5150 AutoSport Billet Main Caps\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eCNC-machined from high-strength billet steel\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHeat treated for maximum durability and strength\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDowel-pinned design for precise cap location and reduced cap walk\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIncreased rigidity over OEM cast main caps\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReduced main cap flex under extreme cylinder pressure\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eImproved crankshaft stability at high RPM and boost\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMore consistent main bearing bore geometry\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBetter oil clearance control for increased bearing life\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eA stronger foundation for high-performance and race-built B48 engines\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eWhen you're building a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e900+ WHP B48\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, every thousandth of an inch matters. Our billet, heat-treated, dowel-pinned main caps keep the crankshaft securely located, providing the bottom-end stability required to withstand extreme boost, high RPM, and the abuse of competitive motorsports.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eImportant:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Billet main caps are \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003enot\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e a simple bolt-on upgrade. The engine block and main caps must be precision machined, followed by \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ealign boring and align honing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, to restore perfect main bearing geometry and ensure proper bearing clearances.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBuilt for racers. Proven through real-world testing. Engineered by \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e5150 AutoSport\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for the next generation of high-horsepower B48 engine builds.\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003ca href=\"https:\/\/5150autosport.com\/blogs\/product-faq\/b58-s58-billet-main-caps-cap-walk\" style=\"color: rgb(0, 0, 0); text-decoration: underline;\"\u003e\u003cstrong\u003eFor a detailed look at the engineering, testing, and benefits of our Billet Main Caps, read our full technical article.\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003ca href=\"https:\/\/5150autosport.com\/blogs\/product-faq\/b58-s58-billet-main-caps-cap-walk\" style=\"color: rgb(255, 42, 0);\"\u003ehttps:\/\/5150autosport.com\/blogs\/product-faq\/b58-s58-billet-main-caps-cap-walk\u003c\/a\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"5150 AutoSport","offers":[{"title":"Default Title","offer_id":53807198437683,"sku":"5150-BMC-B48","price":899.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0735\/3827\/3587\/files\/IMG-0321.png?v=1785357409","url":"https:\/\/5150autosport.com\/zh\/products\/b48-billet-main-caps-by-5150-autosport","provider":"5150 AutoSport","version":"1.0","type":"link"}