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D3 Type Head Closed Ports

The search for intake flow ends about 1/2 inch into the combustion chamber. In just the same way, the search for exhaust flow starts in the region around the exhaust valve.
A Super Head for Small-Block Fords

 The search for intake flow ends about 1/2 inch into the combustion chamber. In just the same way, the search for exhaust flow starts in the region around the exhaust valve.  View Related Article

 

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