302 casting swirl port heads

302s are swirl port. It's the shape of the throat and guide boss that imparts the swirl. The chamber is closed but they never had any swirl or tumble, or quench affect as a result because the pistons were too far away. The key was the head's intake ports, and "pre-Magnum" exhaust ports. GM used that ramp within the port to do the same thing. Lary Widmer was a key developer IIRC. The same design was used to create the high swirl 360 heads (596 heads IIRC?)