Manufacturer's Part Number:
Summit Racing Part Number:
Mechanical roller tappet
Basic Operating RPM Range:
Intake Duration at 050 inch Lift:
Exhaust Duration at 050 inch Lift:
Duration at 050 inch Lift:
242 int./248 exh.
Advertised Intake Duration:
Advertised Exhaust Duration:
280 int./286 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
Exhaust Valve Lift with Factory Rocker Arm Ratio:
Valve Lift with Factory Rocker Arm Ratio:
0.646 int./0.653 exh.
Lobe Separation (degrees):
Intake Valve Lash:
Exhaust Valve Lash:
CB XR280 R-10
Valve Springs Required:
Requires thrust button and wear plate.
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