the h23 block is the toughest built honda motor for one reason. the block has a web style design that no other honda block has got and maks it super strong. they are bad about spinning rod bearing if you are ruff with them. but i seen them take alot of punishment before they go. I got laser-cut custom spec crank and then balanced and blueprinted my block so until i got badass pistons and rods i would have to worry as much. it just varys depending on driver and engine.