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They are designed to increase lobe lift over stock which is about 1.5 as well as be a more rigid design to reduce valvetrain flex. Also the roller tip cuts down on friction. These are a cheap brand though. IMO rockers aren't something you want to cheap out on.
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--==RPM Resto & Custom==--
1989 IROC-Z Media Coverage:
Chevy High Performance - Readers Rides 4/03
GM High Tech Performance - Tech Article 3/06
Chevy Rumble - Tech & Feature Articles November 2006
Auto Restorer Magazine - Feature Article 5/11
SkinAndSteel.com
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