What are the timing specs on a 390 Big Block from 1969 Mercury that is in 1972 Ford F-100?
The year and engine are mismatched in your question. The 390 Big Block engine was installed in Mercurys from 1963-1970. The 1972 F-100 was equipped with the 390 engine from 1969-1971. I can provide the timing specifications for both engines if you let me know which exact one is installed.