first off i apologize for my lack of experience..but i have a b18a question..
can the valve springs from a b16 or b18c head be installed on a b18a pr4 head safely in order to "stiffen" the b18a valvetrain and possible allow a little safer revving?

 

No they can't. There is a difference in sizes between the VTEC and LS heads.

 

no, unfortunantly, the vtec valvetrain won't work. i just went frankenstein and have crower dual springs and titanium retainers for a1/b1 heads. i'm selling the springs and retainers for 120 shipped. i also have a b16 intake manifold made to fit ls. pm me if you are interested.