Engine Kits

COMP Cams 20-744-9 Xtreme Energy Camshaft XR258  Super Strong Torque
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COMP Cams 20-744-9 Xtreme Energy Camshaft XR258 Super Strong Torque



Part #: 20-744-9
List Price: $708.46
Our Price: $354.23
You Save: $354.23



COMP Cams 20-744-9 Xtreme Energy Camshaft for Chrysler 273-360 C.I. 8 CYL. 1964-2000

Common Usage: Mild street performance to mild race
Key Benefits: Minimal maintenance, little or no valve train noise and economical cost
Limitations: Long-term wear, limited rpm range, lobe profile limitations

A popular street camshaft used with pre 1985s original overhead valve OEM engines, the hydraulic flat tappet cam is commonly used in up to mildly aggressive performance profiles. The flat tappet lifter has a flat appearing base (this surface is actually slightly crowned) that rides on the cam lobe face, rotating slowly within the lifter bore to promote proper oiling. Internally, the lifter features a cavity that fills with oil and a piston that is depressed by the pushrod (and valve spring). 

This “hydraulic chamber” provides a cushion of fluid to soften the impact on the valve train, creating room for expansion as the engine reaches operating temperature. Hydraulic flat tappet camshafts deliver quiet operation at street to mild racing engine speeds. The biggest advantage to hydraulic flat tappet lifters is that they do not require constant maintenance to ensure proper valve lash. Hydraulic flat tappet camshafts/lifters are pre-loaded at initial start-up and require little, if any, maintenance from that point forward. Flat tappet lifters can only be used once per camshaft and must be replaced due to wear patterns created by the direct contact of the cam with the lifter base.

Advertised Duration 258 int./264 exh.
Advertised Exhaust Duration 264
Advertised Intake Duration 258
Basic Operating RPM Range 700-4,800
Brand COMP Cams
Cam Style Hydraulic roller tappet
Computer-Controlled Compatible Yes
Duration at 050 inch Lift 206 int./212 exh.
Exhaust Duration at 050 inch Lift 212
Exhaust Valve Lash 0.000 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.480 in.
Grind Number CRS XR258R-12
Intake Duration at 050 inch Lift 206
Intake Valve Lash 0.000 in.
Intake Valve Lift with Factory Rocker Arm Ratio 0.480 in.
Lobe Separation (degrees) 112
Notes May require computer modifications. Stock springs cannnot be used.
Part Type Camshafts
Product Line COMP Cams Xtreme Energy Camshafts
Quantity Sold individually.
Valve Lift with Factory Rocker Arm Ratio 0.480 int./0.480 exh. lift