Enlarging the capacity will give you more power, but you lose ve (not that aseries are renowned for theirs) And absolute output (in hp) as Enlarging the capacity will give you more power, but you lose ve (not that aseries are renowned for theirs) Piston speeds increase and have a tendency to snap the crank or rip the mains out of the block. But as pointed out as long as you don't rev them hard then your okay. Better yet turbo charge it and forget about the rpm!