The Andrews question was answered so I have a ahole and opinion. The Woods W6H in my 89" is undectectable, quiet as a stocker. ADJUSTABLE PUSH TUBES

Cam threads can get goofy like a oil thread so staying simple, Intake valve closing means so much in building a street motor, lower intake closing numbers are compression builders, Andrews mastered is it early with earley intake closing mixed with more aggressive lobes.

Dave Mackie gets alot out of the old school 580 with a earlier than normal for larger cams 42 intake closing and 580 lift using basic cam lobes, the W6H is the same with square lobes so took it another level