Ok I'm sold. The OS 1.60 it is (my wallet isn't fat enough for the YS 1.60DZ, but those look significant). Al, do you have a fuel pump on your 1.60 in the Cap 232? Mike reports not having one on the SU31 3D he reviewed (nice, comprehensive review by the way Mike. Man, I'll be referring to that during assembly over and over). Other threads speak to a Perry fuel pump really helping the O.S. 1.60 - particularly for 3D stuff; it seems like a non-weight issue while perhaps helping the engine?