The following are known Action Replay Codes for Machine Head on Sony Playstation (PS1).

The codes should work with the region specified but may work for other regions as well.

Device Compatibility: Action Replay, CodeBreaker & GameShark

Infinite Disruptor
800c21880064

Infinite Flame Thrower
800c217400fa

Infinite Grenades
800c21840064

Infinite Armor
800bf66000fd

Infinite Io-Storm
800c218c0064

Infinite Photons
800c21800064

Infinuite Homing Missiles
800c217c0064

Infinite
800c21780064