{"product_id":"arp-head-studs-part-no-146-4201","title":"ARP Cylinder Head Studs for Jeep 4.0L - 146-4201","description":"\u003cp\u003eThis ARP 146-4201 kit replaces the Jeep 4.0L cylinder head bolts with studs. It is one of the first upgrades made to an engine that is going to have its power increased, because the head gasket is one of the points that fails first.\u003c\/p\u003e\u003cp\u003eThey are manufactured from 8740 chrome-moly steel, heat-treated by ARP itself to a tensile strength of approximately 190,000 psi. ARP grinds each stud after heat treatment to ensure it is straight and concentric, and rolls the threads at the end of the process; this achieves a fatigue strength about twenty times greater than that of a thread made before heat treatment.\u003c\/p\u003e\u003cp\u003eFollow the torque and tightening sequence in the ARP instructions, which are calculated for their assembly lubricant; with engine oil, the actual torque changes. Before ordering, confirm your engine code; if you are not sure, we can help you check it.\u003c\/p\u003e","brand":"ARP","offers":[{"title":"Default Title","offer_id":53894438093134,"sku":"ARP-146-4201","price":229.89,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0816\/7329\/0062\/files\/146-4201.jpg?v=1790662321","url":"https:\/\/driftandgrip.com\/en\/products\/arp-head-studs-part-no-146-4201","provider":"Drift \u0026 Grip","version":"1.0","type":"link"}