I ran a 160 all last spring,summer & fall with out any problems. Temps avg'ed under 180 even on the hottest days.

I went to a 180 come winter for 2 different reasons.
1) To cut down on condensation buildup in the valve cover.
2) I saw an old Jim Handy film on youtube which indicated that these old stovebolts were designed to run at 180 degrees.

The 180 did cut down on the condensation buildup and the temps have been avg'ing right at 180 this winter which gives me real good cab heat.

I've kept the 160 just in case my old 216 runs hot come 90 d+egree summer days.
Dave