Final answer:
The long-count bout in 1927 featured boxers Gene Tunney and Jack Dempsey, with Dempsey's delayed retreat allowing Tunney recovery time that influenced the match outcome.
Step-by-step explanation:
The two boxers involved in 1927's long-count bout were Gene Tunney and Jack Dempsey.
This event is a significant part of boxing history and is known for the controversial 'long count' in which Dempsey knocked down Tunney, but failed to retreat to a neutral corner, delaying the start of the count.
This delay allowed Tunney extra time to recover and he eventually won the match, retaining his heavyweight title.