Manufacturer's Part Number:
Summit Racing Part Number:
Hydraulic roller tappet
Basic Operating RPM Range:
Intake Duration at 050 inch Lift:
Exhaust Duration at 050 inch Lift:
Duration at 050 inch Lift:
212 int./218 exh.
Advertised Intake Duration:
Advertised Exhaust Duration:
264 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:
Exhaust Valve Lift with Factory Rocker Arm Ratio:
Valve Lift with Factory Rocker Arm Ratio:
0.480 int./0.480 exh.
Lobe Separation (degrees):
CRS XR 264R-12
Valve Springs Required:
May require computer modifications. Stock springs cannnot be used.
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