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The 920's on the D/Dart had 1.87 intake and 1.50 exhaust valves.

When you put all the D/Dart parts on the 273, you might get the extra 40 HP. The D/Dart race teams blueprinted the engines to get the extra HP out of them. The car had headers that went into a special y-pipe that had the header adapters already on it. It also came with 4.86 gears. They ran...