{"product_id":"high-rpm-hydraulic-lifters","title":"High RPM Hydraulic Lifters","description":"The Atomic High Rev 'Anti Pump-Up' Hydraulic Lifters are purpose-built for the extreme demands of high-RPM Ford Barra DOHC engines, addressing critical valvetrain stability issues.\n\nDeveloped in collaboration with Crow Cams, these lifters are engineered with modified internal valving that provides a significantly faster bleed-down rate—approximately double that of standard units. This high-flow valving prevents pump-up at high RPM and under aggressive ignition-cut rev limiters, allowing the lifter to discharge oil instantly under sudden valvetrain shock. This helps maintain correct zero-lash tolerance without over-extending, which can lead to valve float, loss of compression, and potential piston-to-valve contact.\n\nThese lifters are reliable beyond 8000 RPM and are ideal for high-performance street and race applications, promoting stable valve control with stiffer springs and big cams. They reduce wear and extend the life of valvetrain components, making them a must-have upgrade for any high-RPM or turbocharged Barra build. The maximum recommended preload for street use is 0.75mm (0.030\").\n\nIt is critical to note that all hydraulic lifters require correct preload checking during installation. Excessive preload can cause valve train noise, reduced lifter life, valve float, loss of power at high RPM, and potential valve burning due to incomplete valve closure. Always install in a clean environment and follow standard camshaft break-in procedures if installing with new cams.","brand":"Atomic","offers":[{"title":"Default Title","offer_id":52687005581624,"sku":"306520-24","price":411.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/660184487.webp?v=1784879383","url":"https:\/\/store.motormia.co\/products\/high-rpm-hydraulic-lifters","provider":"MOTORMIA","version":"1.0","type":"link"}