KBELLISON,
    Come on now.  Remember my Great-Grandmother's old saying????   "The LAZY
Man Suffers The MOST Pain."  Don't convert that double valve to a single as a
panacea or with the statement that it 'll be "BETTER THAN NEW".  Next time
you go have your car serviced, have them disconnect 2 cylinders so it will
use less gas and run better.
    The "over-amplification" comment is misleading.  The response of a
double valve is "OUTSTANDING"!!!  The single valve system took its place for
cost effectiveness.  That's all.

Robin Pratt