going to buy a Cadillac 500 or 472 not sure the actual cubic inch, but anyways the guy said its out of an early 70's Cadillac. i know in 1970 the 500 and 472's compression ratio was way up and produced a lot more torque and horsepower, but later years suffered tremendously, i wanted to know if there's anyway to spot a difference between the years visually. the motor is 2 hours away and im going up to look at it on saturday. he sent me two pics of the motor and before i go up there and look at the motor i wanted to see if anyone on here knows anything about them. Thanks!