Roger Maris holds the single season home run record
http://www.betus.com.pa/sports-betting/mlb-baseball/articles/why-roger-maris-record-still-stands/
The "real" record belongs to Maris who played in an era where the only cheating going on was mediocre pitchers scuffing up balls – not players injecting themselves with all kinds of performance-enhancing substances in order to increase their strength exponentially in an effort to crank out more home runs than they normally would without any assistance from steroids.
Roger Maris holds the single season home run record. The real single season record.