I wonder why Jesse Lackman only tested one side of the Magnum manifolds but both sides of the 340 manifolds?

I remember Jesse Lackman did revealling measurements that factory Magnum rocker arm ratio is actually greater than 1.60 ratio.

His test of Singh grooves in quench flats showed only minor gains.

That Lackman dyno test mule 360 Magnum V8 has flat top pistons.