The Shubeck/Smith Machine is the best hydraulic lifter for radical lobes/rpm. They have a ceramic puck and can be used on many cams without break in. They are around 1,000 bucks a set but buy only once. I run 200 seat and 425+ over the nose at 7000+. Be vigilant on checking springs as if they get weak you can bounce the lifter and the ceramic has been known to shatter making a real mess. I have been using these for a long time without issue but am fanatical about checking things over.
1959 Bugeye Sprite 1967 Charger Black L code 1967 Coronet R/T Convert Green 440 auto bought from original owner 1968 Charger R/T Bronze 440 4 spd console AM/FM 1969 Super Bee WM21H B5 A40 D21 N96 1969 Barracuda Formula S 340 Convert pilot car 1969 Hemi Road Runner RM23J D32 Omaha orange 4.10 Dana N96 N85 1970 Super Bee WM23N FE5 V1X 3.91 axle package, N96 1970 Road Runner RM21N B3 V1X D13 1971 MG Midget 1971 Road Runner RM23H GW3, A57 1972 Road Runner RM23P FY1, D21
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