Greetings, my name is Matt. I am new to the Thunderbird community. I recently purchased a 96 T-bird 4.6. I have had two other Fords, a 84 GT350 mustang and a 90 5.0. Anyways, my question is: Are valve adjustments required for these cars? I tried searching and no luck. I hae had other OHC cars such as Hondas and I did them every 20k miles to be safe. There is a slight tapping sound at certain RPM's in my bird. If so what are the requirements and specs? Thank you for your time and I have learned alot about my car since reading on this site.