{"product_id":"s-s-shovel-tappet-guides-for-evo-tappets","title":"S\u0026S, Shovel tappet guides for Evo tappets","description":"Polished. Allows you to use the improved hydraulics of Evo tappets in a Shovel. When retro-fitting these billet aluminum tappet blocks to a Shovel engine you must use 86-99 Evolution Big Twin hydraulic lifters; an Evo style camshaft and S\u0026amp;S Quickee pushrods. If desired you can oil the top end through the pushrods (with 512497 Quickee pushrods); Evolution style; when using S\u0026amp;S Shovel roller rockers (512493).   Note: An Evo cam will have about 9% reduction in valve lift due to the lower S\u0026amp;S Shovelhead rocker arm ratio (1.5); when compared to the stock Evo rocker arm ratio (1.625). The stock rocker arm ratio of Shovelhead rockers is 1.43.  Note: Adjustable pushrods are required. Also required are 512511 pushrod retainers\/clips\/keepers when using 512494 Evo style tappet blocks for Shovel. Since these tappet blocks are longer a shorter retainer of 2.800\" length is required for correct pushrod cover spring tension.\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e 66-84 Shovelhead (NU). With Evo tappets; Evo cam; S\u0026amp;S Quickee pushrods for easy install\u003c\/p\u003e","brand":"S\u0026S","offers":[{"title":"Default Title","offer_id":54307920445767,"sku":"512494","price":866.47,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0987\/7812\/0519\/files\/512494k.jpg?v=1784486247","url":"https:\/\/www.chopperessentials.com\/products\/s-s-shovel-tappet-guides-for-evo-tappets","provider":"Chopper Essentials Co.","version":"1.0","type":"link"}