what stroke to buy?
 

Wanted to know if I could stroke with out changing rod length or piston hight? Reason for question is, I already bought forged rods & piston but in a stock length. ( I know DUHH). Now I wanted to add some cubes but dont want to lose money already invested. Oh sorry pistons are 4.040 dia. stock hight + rods are stock length too. Any advise would be greatly appreciated thanks. Is this even possible.