I sent Cam a text and asked him to look, if he answers I'll let you know. Or call him and say you wanna buy Greylynn's carbs, he'll know I spoke with him today. I'm in Greenland, so I don't have the carbs, best to call him for a unbiased opinion on them, since he set them up. I never ran them, so I don't know what they are drilled to, they came with a 4DM I bought and I switched to Lectrons before I ever ran the motor.