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D3 Type Head Open Ports

Because more of the exiting exhaust gases come from the region nearer the center of the cylinder, the exhaust port is shaped with a small but discernable bias in that direction.
A Super Head for Small-Block Fords

 Because more of the exiting exhaust gases come from the region nearer the center of the cylinder, the exhaust port is shaped with a small but discernable bias in that direction.  View Related Article

 

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