{"product_id":"head-stud-kit-arp-201-4602","title":"Head Stud Kit ARP 201-4602","description":"\u003cp\u003eFor the BMW 535, obtaining the optimum cylinder head-to-block sealing is especially critical in small displacement engines that employ high compression pistons or power adders like turbochargers, nitrous oxide, and superchargers.\u003c\/p\u003e\u003cp\u003eThat's why head studs from ARP are popular among leading Sport Compact\/Import racers.\u003c\/p\u003e\u003cp\u003eIt should be noted that ARP uses a premium grade 8740 alloy rated far superior to 'aircraft' quality.\u003c\/p\u003e\u003cp\u003eEach stud is precisely heat-treated to 200,000 psi.\u003c\/p\u003e\u003cp\u003eAfter heat-treat, each stud is centerless ground to make it as close to perfectly concentric as possible.\u003c\/p\u003e\u003cp\u003eThis procedure involves about ten very slight cuts and results in an exceptionally straight part.\u003c\/p\u003e\u003cp\u003eIt's important to note that lesser quality studs are not even centerless ground; the material is thread rolled in bar stock form, mostly before heat-treat, when the material is easier to machine.\u003c\/p\u003e\u003cp\u003eBecause ARP studs are manufactured to such exacting tolerances, you will note that gaskets and cylinder heads literally glide into position and are perfectly aligned, something that won't happen with inferior quality head studs.\u003c\/p\u003e\u003cp\u003eARP studs are thread rolled after heat-treat, which gives them about 1000% (that's ten times) better fatigue strength than those studs that are threaded prior to heat-treat.\u003c\/p\u003e\u003cp\u003eYou will also note that ARP offers specially undercut studs for several engines.\u003c\/p\u003e\u003cp\u003eThis procedure, done only to the shorter studs, more equalizes the 'stretch' of both studs, which makes for a more consistent clamping force that compensates for head gasket compression when the head is installed.\u003c\/p\u003e\u003cp\u003eThis helps prevent blown head gaskets and assures optimum sealing.\u003c\/p\u003e","brand":"ARP Inc.","offers":[{"title":"Default Title","offer_id":51709146169626,"sku":"ARP201-4602","price":260.23,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0975\/8942\/8506\/files\/81sSE_UipwL.jpg?v=1771335465","url":"https:\/\/trybeepbeep.com\/products\/head-stud-kit-arp-201-4602","provider":"TryBeepbeep","version":"1.0","type":"link"}