small block vs. big block .15
 

OK, aside from the obvious physical size difference in these two engines, what exactly is the benefit/difference of a bb .15 as opposed to a sb .15? Tower has one for under $110 (.15 RX) which I could shoehorn into my LD3 with the adjustable mounts. Since it's a bit smaller than a .21 (it is, isn't it?) I shouldn't have to dremel the chassis in any way. It'll only be for fun, but only if I see any gain over a .15 CV-RX