PORTING POLISHING OF AN BMW M3 CYLIDER HEAD ,TO GAIN MORE POWER

Please note knife edged cylinderhead ports , they are also match ported and streamlined and naturaly ported and polished ,this engine were dynoed after top end enhancement at a mighty
280 + horsepower not bad for the otherwise stock S-52 engine /stock 240 horses from the factory,looks like a piece of art .