VZ-M 21 all the way.

I don't know why OS made the .32 that way, normally as you go bigger in engine it should be better, but sometimes bigger is not always better.

the VZ-m would be the better of the two, why is the 32 so low.........could be the number of ports, porting, timing, head volume etc.
I'm sure I forgot something.

CMB Valvola 21, NovaRossi 21 and the LS 21, MAC 21(the real MAC not the russian one) VZ-M, Modified TT Pro.
if you put a .28 I believe that you won't be running with the 21's but rather the 45's.

Dan.