Cam thrust button with hydraulic lifters?

[Alan Nyhus]

What are the pros and cons of running a thrust button in a non-roller camshaft application? With the cam lobes having a 1.5-2 degree taper, it would seem that a thrust button wouldn't be needed.

Block is an early small block Chevy, not the later block with the cam thrust plate. Cam and crank gear are in perfect alignment (checked with the intake on and the distributor in).

Thanks! -Al