i have used chet herberts cams for yrs. i ordered this particular cam by the dozen. it is 275 adv int 475 lift, 285 exh adv and 500 lift worked well for me, went 14.0s in a 64 fairlane. installed several in customers engs and none ever complained. it has about 220 @ .050 duration, and 225 @.050on the exhaust, and cheap. never lost a lobe or lifter.