MCODE MONSTERFULL RESULTS1970 SMALL BLOCK HP CHAMP? Rated at just 300 (gross) hp, this little know 351 Cleveland actually made more power than (almost) any of the other Muscle Car small blocks up to 1970. Despite the mild cam, the Cleveland offered massive head flow not available from GM or Dodge. Only two other small blocks made more power, and both sported Cleveland heads.