The difference in the advertised lift and the "approximate" lift you are seeing is because the advertised lift is when using 1.5 rockers. Since you stated that you are using 1.6 rockers the lift will be increased.Jackson72ss said:
Whenever swapping out the cam (especially when swapping out the rockers with a greater ratio); you need to check the valve to piston clearances before ever running the engine.
SIDE NOTE:
That 850cfm Demon carb is way too big for your motor for street use.