Hmmm... your way of asking about a new engine details refering to it as a "heart", you're one of those, so I can't really help you. Learn proper terms and maybe someone will take you seriously.
Well, all I can say if you are going to do that, do a stroker at a minimum.
(a heart pumps blood, and engine turns fuel and air into exhaust and turns a flywheel, hardly the same)