Which way do you put this in, Hub, flat side to motor or beveled side to motor?
SM says
??Install the gaskets so that their chamfer sides [C] face the
front.
Sounded to me like they were suggesting the bevel to face the header and the flat to face the outlet on the motor.
When I removed the old gaskets, it seemed as though some had originally been installed flat to motor and some bevel to motor.