I read that the O-540-A1A5 weighs 396 pounds, but that a IO-540-A1A5
weighs 437 pounds. Can the difference between a carb and fuel
injection really be 39 pounds?

Also, as I wrote an IO-540-A1A5 weighs 437 pounds. But an IO-540-c4b5
weighs 402 pounds, but produces 50 horsepower less. What did they
change about the engine that costs 50 horsepower but saves 35 pounds?

-Very Curious
-Charles Talleyrand