Top 10 Heavyweight Punchers of All Time - Hardest Punchers in Boxing Ever

This video is featuring Amazing never before seen footage of Rocky Marciano and Sonny Liston.
The video tries to rank the raw power of well known heavyweight fighters. I colorized some clips with Deoldify Colorization. Teaser to my Rocky Marciano in Full Color video.

Note:
This is a ranking based just on Power not after the greatness of the puncher
Based on KO rates, statement of former rivals and the "eye test". Note that it can be hard to rank them, some of the rankings are based on statements others are subjective. Some fighters on this list are interchangeable based on opinion. Only a guy who got hit by all of these could rank them accurately.