{"product_id":"23432","title":"Head \u0026 Main Stud Combo Kit  - 1983–1998 3.9L 4BT 4CYL Dodge Cummins","description":"\u003ch6 class=\"text-text-100 mt-2 -mb-1 text-sm font-bold\"\u003e\u003cstrong\u003eFortify the 4BT From Top to Bottom.\u003c\/strong\u003e\u003c\/h6\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe 4BT earned its reputation by refusing to quit — so build it to match. This combo pairs our 3.9L 4BT head stud kit with our main stud kit, locking down both ends of the engine in a single upgrade. Head studs seal the cylinder head against boost and heat up top, while main studs stabilize the crankshaft main caps down below. Whether it's powering a swap build, a work truck, or an off-road rig, this is the foundation that holds up under pressure.\u003c\/p\u003e\n\u003ch6 class=\"text-text-100 mt-2 -mb-1 text-sm font-bold\"\u003e\u003cstrong\u003eWhy Drivers Choose XOTIC PERFORMANCE™\u003c\/strong\u003e\u003c\/h6\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eTop-to-Bottom Strength\u003c\/strong\u003e – Head studs keep your head gasket sealed under turbo pressure and heat, while main studs add bottom-end stability and help prevent main cap walk under load.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eSuperior Clamping Force\u003c\/strong\u003e – Studs torque cleanly and stay stationary instead of twisting like bolts, delivering more consistent clamp load and reducing wear on your block and head threads.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eXOTIC 7200 Material\u003c\/strong\u003e – Built from our 7200-series alloy for greater tensile and yield strength than standard 8740 chromoly, with threads rolled after heat treatment for maximum fatigue life.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eEverything You Need\u003c\/strong\u003e – Complete head stud and main stud hardware in one kit — studs, 12-point nuts, hardened washers, rocker bolts, assembly lubricant, and install tools.\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e\n\u003cstrong\u003eLifetime Warranty\u003c\/strong\u003e – Every fastener is backed by XOTIC PERFORMANCE™ for total peace of mind.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal\"\u003eThe smart choice for 4BT builders who want to do it once and do it right — seal the head and secure the bottom end in a single upgrade.\u003c\/p\u003e","brand":"XOTIC PERFORMANCE™","offers":[{"title":"Default Title","offer_id":51830500196568,"sku":"CP896-CP884","price":279.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0083\/9394\/9274\/files\/2_90399493-6733-4a85-8e8a-e8c38f23ad6f.jpg?v=1781643850","url":"https:\/\/www.xotic-performance.com\/en-ca\/products\/23432","provider":"XOTIC PERFORMANCE™","version":"1.0","type":"link"}