How much does it usually cost to get 1.6 ratio roller rocker arms installed? What is the power gain on an LT1?

 

Have no idea on the cost for install, not really hard, I did it myself. Gains are different depending on other mods. A guy here once got 15-20rwhp with his if I remember right (with heads/cam/etc). Most mild cars see around 10rwhp. They really seem to boost top-end, You can feel it big time.