I'm revving stock Ford lifters to 7500+ without incident. Many of the guys in Street Warrior and Pure Street are regularly going this high and higher. I've even seen 8000+ with the stock hydraulic roller lifter. Hell, my motor never sees less than 6100 the entire pass down track!
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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