little 'ol 273

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 my D/Dart with 5.30's back in 1966 and were in the high 12's - low 13's at 105.
The D/Darts all had closed chamber 920 heads with 1.87 intakes and 1.50 exhausts. This head was also used on the 1966 w/cap engine. The 920's also came with 1.78 intakes.