The spelling of the phrase "am head of" is mostly straightforward. The first word, "am", is spelled as it sounds, with the short vowel sound /æ/. The second word, "head", is also spelled phonetically, with the long e sound /hɛd/. Lastly, the word "of" is spelled with the short o sound /ɑv/. Overall, the spelling of "am head of" is relatively simple, with each word being spelled according to its corresponding sound.