Chevrolet Factory Cam Specs

Chevrolet Factory Cam Specs by part number
Part #          Lifter type–duration at .050 In/ex–Lift in/ex–centerline–description
Small Blocks
3849346      Mechanical –  254/254 – .484/.484 – 114 – 327 365HP& Z-28 302
3863151      Hyd.            – 221/221-.447/.447-114 –  327-350HP, L79
3896929      Hyd.            – 195/202 – .390/.410 – 112 – 327 300 HP
3896962      Hyd.            – 222/222 – .450/.460 – 114 – 350 L-46, L-82
3927140      Mechanical – 257/269 – .493/.512 – 112 – Off Road
3965724      Mechanical – 262/273 – .488/.509 – 112 – 2nd design road race, short track
3972178      ?
3972182      Mechanical – 242/254 – .459/.485 – 116 – 70 LT1 360 & 370HP, 71 LT 330 HP
10134334    Hyd. Roller – 235/235 – .480/.480 – 114 – 350ZZZ and ZZ2 Crate Motor
10185071    Hyd. Roller – 208/221 – .474/.474 – 112 – 350 345, ZZ3&4 Crate Motor
10224241    Hyd. Roller –                                           –  92-94 GenII, LT1, 350
10243779    Hyd. Roller –                                           –  94-96 Gen II, L99 265 V-8
12353914    Hyd.            – 180/194 – .378/.401 –         – GM Crane  Lo speed Hi torque
12353915    Hyd.            – 194/204 – .401/.423 – 104 – GM Crane street
12353916    Hyd.            – 204/214 – .423/.446 – 110 – GM Crane 305-350 street legal 50 states
12353917    Hyd.            – 204/214 – .420/.441 – 112 – GM Crane nan-emissions vehicles & off road
12353918    Hyd.            – 214/224 – .442/.465 – 112 – GM Crane marine & off road
12353923    Hyd.            – 224/234 – .465/.448 – 114 – GM Crane off road
12364050    ?
12364051    ?
12364052    ?
12364053    ?
12364054    ?
12370845    Hyd. Roller – 214/224 – .488/.509 – 112 – Off Road, lobe for mech fuel pump
12370846    Hyd. Roller – 222/230 – .509/.528 – 112 – Off Road, lobe for mech fuel pump
12370847    Hyd. Roller – 232/242 – .539/.558 – 112 – Off Road, lobe for mech fuel pump
12551142    Hyd. Roller – 203/210 – .476/.480 – 115.5 – 96 350 LT4 w1.6 roller rockers
12551705    Hyd. Roller – 201/208 – .447/.459 – 112 – 95-96 Gen II, LT1, w center dowel pin
14088843    Hyd.            – 202/206 – .403/.415 – 115 – 305 HO, 83-86
14093643    Hyd. Roller – 202/206 – .403/.415 – 115 – 87 350 Corvette, IROC Camaro
24502476    Hyd.            – 121/220 – .435/.460 – 112.5 – 350 300 crate motor
24502586    Hyd. Roller – 218/228 – .525/.525 –         – 96 LT4 H.O.T. crate motor, use with 1.6 roller rockers
NA              Hyd. Roller – 202/210 – .472/.478 – 111 – 97 Gen III LS1 Corvette 350 uses 1.7 roller rockers