1969 was the last year for the 273 2bbl...last year for the Charger/Commando engine was 1967, which was also the end of the solid lifters, both 2 and 4bbl. 273 got hydro lifters and cast crank same as 318 for 68-69. 1968 was the intro of the 340, which basically obsoleted the 273-4bbl engine.
