340 dyno chart thoughts

I literally just said in my post above that it being a solid cam would explain the higher vacuum. Your .014"/.016" isn't "virtually zero lash", it would be enough to eat up 10 degrees off the lobe spec for that solid cam's duration. Mystery solved. Turns out you're not a miracle worker after all.

I agree with the direction of the math but not the duration. To get the movement at the cam you would have to divide the lash by the rocker arm ratio. So you're not going to decrease the duration 10 degrees but more like 6 degrees. Already made that mistake for myself.