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Custom Big Bore Engine Cases for GY6 150 Long Engine. We machine these in matched pairs ourselves! They are bored to fit up to a 63mm Performance Cylinder Kit. Go big. Cases are matched Right side and Left side, and stamped with a serial number to make sure you have a perfectly matched set. Check out the following Cylinder Kits that will work with these cases on a GY6 150 Engine: 57.4mm Cast Iron, 59mm Cast Iron, 61mm Cast Iron, 63mm Cast Iron, 58.5mm Ceramic, 61mm Ceramic & 62mm Ceramic.
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