Cam Specs
  • CAM NUMBER
  • VALVE LIFT
  • VALVE DURATION AT .040"
  • LOBE CENTERS
  • DESCRIPTION AND APPLICATION
  • INTAKE OPEN/CLOSE
    EXHAUST OPEN/CLOSE
  • RUNNING CLEARANCE
  • 258-x2
    This is essentially a BT-C01
  • .502"
    .502"
  • 268°
    268°
  • 108°
    108°
  • Road-race. Must use modified pistons and
    springs. Mid-range and top-end power.
  • 26° BTDC
    62° ABDC
    62° BBDC
    26° ATDC
  • .005"
    .007"
  • 258-x5
    This is between a BT-C04 and a BT-C05
  • 420"
    420"
  • 264°
    264°
  • 108°
    108°
  • OK with stock pistons. Spring kit
    recommended. Improves mid-range power
    in an otherwise stock motor. Check clearances.
  • 24° BTDC
    60° ABDC
    60° BBDC
    24° ATDC
  • .005"
    .007"
  • 258-x3
    This is essentially a -C01 with less lift.
  • .495"
    .475"
  • 300°
    300°
  • 107°
    107°
  • Must use racing pistons and springs. Road-
    race performance mid-range and top-end
  • 43° BTDC
    77° ABDC
    77° BBDC
    43° ATDC
  • .005"
    .007"
  • 258-x1
  • .580"
  • 283°
  • 104.5°
  • Race only - 1000 motors. Fully modified engine.


  • 251-x18
    This is a -C06 cam.
  • .576"
    .520"
  • 300°
    300°
  • 107°
    107°
  • Full race cam. Top-end. Modify Everything.
    TDC lift in = .254"
    ex = .215"
  • 43° BTC
    73° ABC
    77° BBC
    43° ATC
  • .008"
    .010"
  • Stock
  • .401"
    .401"
  • 245°
    247°
  • 107.5°
    107.5°
  • Stock 750 and 920 for your reference.
  • 15° BTDC
    50° ABDC
    51° BBDC
    16° ATDC


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