{"product_id":"cmi-precision-billet-roller-rocker-arm-kits-1-5-1","title":"CMI Precision Billet Roller Rocker Arm Kit | Air-Cooled VW Type 1 | 1.5:1 Ratio, DLC Shafts (#E15)","description":"\u003ch2\u003e\u003cb\u003eCMI Precision Billet Roller Rocker Arm Kit | Air-Cooled VW Type 1 | 1.5:1 Ratio (#E15)\u003c\/b\u003e\u003c\/h2\u003e\n\u003cp\u003eMore rocker ratio means more valve lift from the same cam — and \u003cb\u003eCMI's 1.5:1 billet roller kit\u003c\/b\u003e delivers it with race-proven hardware. This track-tested assembly features \u003cb\u003eforced-feed oiling\u003c\/b\u003e and \u003cb\u003eDLC-coated shafts\u003c\/b\u003e, engineered to survive extreme lift and high RPM while keeping the valvetrain cool. The 1.5:1 ratio is identified by black anodized end caps.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eVehicle Fitment\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eVW Type 1 Air-Cooled Engines:\u003c\/b\u003e Beetle, Bus, Karmann Ghia, Type 3, and Thing — performance and racing builds running high-lift cams. The 1.5:1 ratio increases effective valve lift, so verify rocker geometry, pushrod length, retainer-to-guide clearance, and coil bind for your specific cam and head combination. Not confirmed for Type 4 engines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eWhy Choose CMI?\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eCMI Precision builds this as a track-tested, fully-machined assembly — force-fed oiling and DLC-coated shafts deliver constant cooling and low friction where stamped rockers fail.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eKey Features \u0026amp; Benefits\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003e1.5:1 Rocker Ratio:\u003c\/b\u003e Identified by black anodized end caps; increases effective valve lift over a 1.4:1 or stock 1.1:1 rocker.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eForced-Feed Oiling:\u003c\/b\u003e Oil routed through the pushrods to the shafts and sprayed onto the roller tips.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBillet Rocker Arms:\u003c\/b\u003e Machined from 7050-T651 aluminum, hard-anodized with a Teflon seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDLC-Coated Shafts:\u003c\/b\u003e 9310 steel shafts with a Diamond-Like Carbon low-friction coating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePrecision Adjusters:\u003c\/b\u003e 3\/8\" H13 tool steel adjusters with ball cups and titanium 12-point lock nuts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGrade 12.9 Mounting Studs:\u003c\/b\u003e With 7075-T651 aluminum blocks and spacers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCooler Running:\u003c\/b\u003e Constant oil bath cools the valve springs and reduces friction at high RPM.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eTechnical Specifications\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eRatio:\u003c\/b\u003e 1.5:1\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRocker Body:\u003c\/b\u003e 7050-T651 aluminum, hard anodized\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eShaft:\u003c\/b\u003e DLC-coated 9310 steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAdjusters:\u003c\/b\u003e H13 tool steel with titanium lock nuts\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBlocks \u0026amp; Spacers:\u003c\/b\u003e Black anodized 7075-T651 aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMounting Studs:\u003c\/b\u003e Grade 12.9\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePart Number:\u003c\/b\u003e #E15\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eFrequently Asked Questions\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eWhat ratio is this kit?\u003c\/b\u003e 1.5:1, identified by black anodized end caps. The 1.4:1 version has blue caps.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWhat does the higher ratio do?\u003c\/b\u003e It increases effective valve lift over a 1.4:1 or stock 1.1:1 rocker, for more flow from the same cam.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eHow does the oiling work?\u003c\/b\u003e Oil is force-fed through the pushrods to the DLC shafts and sprayed onto the roller tips for constant cooling and low friction.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWill these fit my build?\u003c\/b\u003e They fit Type 1 engines; with the added lift, verify geometry, pushrod length, and clearances carefully.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eIs this a CMI product?\u003c\/b\u003e Yes — CMI Precision, sold by Washburn's Metal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cb\u003eExplore Related Categories\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003eComplete your engine build: \u003ca href=\"\/collections\/engine-parts\"\u003eEngine Parts\u003c\/a\u003e, \u003ca href=\"\/collections\/engine\"\u003eEngine\u003c\/a\u003e, and \u003ca href=\"\/collections\/vw-beetle\"\u003eVW Beetle\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eWARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. For more information, go to www.P65Warnings.ca.gov.\u003c\/p\u003e","brand":"CMI","offers":[{"title":"Default Title","offer_id":44446219763827,"sku":"#E15","price":1300.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0278\/2760\/1523\/files\/1641-2T.jpg?v=1773352016","url":"https:\/\/www.washburnsmetal.com\/products\/cmi-precision-billet-roller-rocker-arm-kits-1-5-1","provider":"Washburn's Metal","version":"1.0","type":"link"}