You realize a 318 has 16% more cubes and everything a 273 commando had 'cept the compression,cam and the weak 4bbl intake? Either will go fast but the 318 will be ft/lbs ahead if built similarly. I took all the guts out of a spun rod 273/4 and put them in a 318 short block, even with its lower compression that motor was much quicker.
