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The bronze inserts were machined for the new valves and oil seals. This photo also shows that the nailhead engines are equipped with large square intake ports for good fuel flow. The runners are short for good fuel velocity.
Building a Better Buick, Part I

The bronze inserts were machined for the new valves and oil seals. This photo also shows that the nailhead engines are equipped with large square intake ports for good fuel flow. The runners are short for good fuel velocity.  View Related Article