85-88 - 266/266 int/exh (at .006), .278" lift (.444" w/1.6's), IO - 17, IC 69, EO 67, EC 19; Lobe center int/exh - 115
89-95 - 276/266 int/exh (at .006), .278" lift (.444" w/1.6's), IO - 20, IC 76, EO 67, EC 19; Lobe center int - 116, exh - 115
Ford doesn't list .050" timing events, so duration numbers aren't available, but they vary all over the place based on folks' measurements out there (I guess Quality wasn't Job 1). Generally, they are around 210 or 212 on intake and exhaust. But I've seen numbers like 219/212 on the early cams. The later cam has more advertised intake duration because Ford slowed up the ramp rate to quiet intake noise. Consequently, according to Ford's footnotes, the early cam with less advertised intake duration is the more powerful cam making 3HP more than the later cam.