273 vs 318

The 318 & 4bbl 273 are close because (for whatever reason) chrysler never hopped up the teener. They share the same valve train & head design. But the 273 got more squeeze & little larger cam. And compaired to the 340 not even same playing feild.larger camshaft yet, bigger valves, bigger ports, bigger better about everything from top to bottom. Now yer correct give the little "Rodney Dangerfield" 318 the same treatment as the 340........ you bet thed be dam close! I chose the 273 mainly because it was the stock motor first off & just like yellow rose mentioned combination is whats key. Not sturing the pot, its all mopar to me! Stock a commando 273 should have an edge on a stock 318. Even the playing feild & well the 318 wins all day!