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

4 comments to Chevrolet Factory Cam Specs

  • Mike Kennedy  says:

    Good Morning…I have a Chevy cam with # 3849347. It’s not listed above but has similar lift to the 346. Is it the same? Thank You, Mike

    • admin  says:

      The 346 cam, its casting number is 347, same same. Supposed to be the 30-30 cam. A dog on the street but sounds mean as hell.

  • Mike Kennedy  says:

    Thank You !…Mike

  • Micky D  says:

    I found a Chevy Tech manual in the trash one day and it had several tech sheets for engine specs from 1961 to 1977. It was very interesting to find several different sbc cam part numbers in the spec sheets and some part numbers were the same as the casting numbers. One cam for 1963 was the 3849347 was .4850 lift and 524 duration which made me think are these tech sheets accurate. The computer is an amazing thing but from the old days the 097 was the solid lift and 098 was the hydraulic lift and I used the 098 in several sbc’s from 283 to 350, very good cam for all around street. the 524 duration mentioned earlier through me off.

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