Piston speed is also a consideration, at over 6000 FPM at just 5000 RPM, this is well beyond the level that cast pistons can safely tolerate for long if at all, much less with almost 12-1 compression. So if the piston weight were the only difference then I could see panics point, but with the added compression stressing the rods along with having .060 removed from the S/E bore compromising the rods strength further...you don't want to be in the drivers seat when it comes apart. The safety factor is what is concerning me more than anything. Just because these parts can be made to fit together, doesn't mean they should.
