Iron vs. Aluminum Heads
Dart's modern heart-shaped combustion chambers and 0.046-inch quench distance help quell detonation even with iron heads and are far superior to old factory castings in this regard. The Dart "solid flat-tappet" heads come with 1.437-inch-diameter valvesprings installed at 1.800 inch and had 130 pounds on the seat and 325 open (0.555-inch valve lift). Valve float with the Comp 306S cam was not a problem even at 6,500 rpm. View Related Article
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