The way to increase the lift of stock cam is regrind the base circle of cam smaller, but there are lot more to do to make sure the stock valvetrain works properly. It might accelerate the wear rate of cam surface and rocker roller or valve bucket, i wont say how fast the wear rate, cos it depends on many factors. In extreme case, fatigue or burnt might occur on the cam surface.
Bump: The way to increase the lift of stock cam is regrind the base circle of cam smaller, but there are lot more to do to make sure the stock valvetrain works properly. It might accelerate the wear rate of cam surface and rocker roller or valve bucket, i wont say how fast the wear rate, cos it depends on many factors. In extreme case, fatigue or burnt might occur on the cam surface.