My SST rocker arms show about 0.020 loss of lift while the aluminum ones show about 0.030 loss. If I had to guess I'd say the pushrod is accounting for 0.010 of the deflection and the SST rocker arm is 0.010 while the aluminum is 0.020. I can double check with a 7/16 pushrod at some point. A 7/16 pushrod is roughly twice as stiff as a 3/8 pushrod so if my numbers are correct I'd pick up about 0.005 lift with a 7/16 pushrod.