POH numbers on TBO

[The-sky-captain]

Why does the POH for my '77 J list the TBO at 1600 hrs? Am I mistaken on the 2000 hr TBO time or has something changed in the last 32 years to make them up the time? I noticed this when I bought the plane last year and had kind of forgotten about it until browsing it on a flight this week.

[N6843N]

Lycoming service instruction 1009at adresses all Lycoming engine TBO's, you are correct at 2K.