Guess the HP

Due to the header?

No, due to the huge bore and relatively long stroke and rod ratio.

In my thinking the piston is hanging around TDC longer opening the intake valve sooner just has the piston in the way.

Plus, intake valve closing is by far the most important thing and closing it 4 degrees early is limiting cylinder fill above peak torque.

Plus, I need to look at exhaust valve opening before we do anything so we don’t step on our wieners.