This concept has been around for a little while, I remember reading about it in CAR magazine some years ago. Since this is a turbo forum I would like to note that this modification is only for NA applications. Gooves like this create hot spots in the cylinder which can cause detonation in turbo applications. My $.02
"There is no such thing as too much boost. You could have too little rod, piston, sleeve, head gasket or timing. But never too much boost."
'91 Nissan 240SX
'96 Nissan 240SX KA-T
'05 Grand Cherokee (4x2)
'85 Honda Nighthawk 450SC