what are roller rockers :S

[kngsv6]

hi there
what are roller rockers? and what do dey do.
ive heard alot about them and just curious

[VR38]

Roller rockers are rockers with a roller tip instead of a flat bit of steel, this usually reduces wear and the way roller rockers are usually mounted provides more valve train stability in high lift and high RPM applications.
Rockers open valves via the push rod in OHV engines.
Google is your friend if you have more specific questions.

[kngsv6]

thanks mateee. helped out heaps..