Super Duty Lifter, 'a' & 'b' Series, Oil Hole, Phosphate Coated Face Hardness Rc63 & Has Correct Face Radius to Work With The Taper That Is Ground On Every Lobe. Only 44 Grams, Rockwell 'c' Hardness 63
Since 1996 the APT website has been a popular destination for British sports car enthusiasts. British Leyland (BMC) 'A' & 'B' Series, all Triumph Engines "We wrote the book on Tuning the A-Series Engine" Authored by well known engine expert David Vizard and original partner in APT. APT specializes in engine and engine parts, and most importantly over 30 years of running them on the road, the track, the dyno and the flowbench.