COPO vs M & O Mopar

[JoeC]

The 440 is a good motor but not one of the Big Guns that were born to race. Most of the American cars are fairly equal when it comes to cyl block, transmissions, rear ends etc. The difference is in the cyl head and intake design. The BB Chevys (square port head) , 426 Hemi, 427 Ford (tunnel port) and Boss 429 Ford (shotgun) engines were built to race. These were not desined as truck engines or for the trailer tow option on your station wagon. They were designed to run over 200mph in NASCAR, run 10 sec ETs in Super Stock, or to beat the best in the world in Can Am, and LeMans. Size does make a differnce - you need big heads to make big power. A good street engine is another story.