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Crane Cams 139021

Hydraulic Roller Tappet Zcamshaft Valve Lift: .610" int/.632" exh

Crane Cams 139021

271-139021

made in usa
jegs shipping
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Estimated ship date 01/05/18 if Ordered Today
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Crane Cams 139021 Hydraulic Roller Tappet Zcamshaft Valve Lift: .610" int/.632" exh $458.86
Hydraulic Roller Tappet ZCamshaft
Lift: .610''/.632''
Advertised Duration: .296°/.304°
RPM Range: 2200-6000
  • Click More Info for specifications

  • Crane Cams 139021 Details

    1965-96 Big Block Chevy 396-454

    Grind Number ZHR-296-2S-12 IG
    Operating Range2200-6000 RPM
    Duration Advertised .296°/.304°
    Duration @ .050" Lift234° Intake/242° Exhaust
    Valve Lift with 1.7 Rockers.359" Intake/.372" Exhaust
    Lobe Separation Angle112°
    Max Lift AngleIntake: 107° BTDC
    Exhaust: 117° BBDC
    Open/Close @ .050" Cam LiftIntake: 10° BTDC (opens)
    44° ABDC (closes)
    Exhaust: 58° BBDC (opens)
    4° ATDC (closes)

    Note: In order to use this camshaft in 1965-66 396 and 427 blocks, it is necessary to machine a 3/16" wide x 7/64" deep groove in the cam's rear main journal to allow oil flow to the top of the engine.

    It is for good reason why virtually all pushrod-style engines manufactured for over two decades are equipped with hydraulic roller cams. The roller's ability to open and close the valves more quickly facilitates the design of more sophisticated camshaft profiles, while the hydraulic lifter body eliminates the need to constantly set valve lash. They have an exceptionally "flat" power curve and are a popular retrofit into older engines.

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