Heim grew up in Marietta, Georgia, the son of Lisa and Ray Heim; his father was a former late model racer and served as Chief Technology Officer at Pen-Tech Associates in Kennesaw, Georgia. Heim graduated from Kennesaw Mountain High School. He began his competitive career in Legends cars, winning the 2016 Young Lions division and the 2017 Thursday Thunder Pro division championship at Atlanta Motor Speedway before graduating to super late model competition through the CARS Tour, Southern Super Series, Pro All-Stars Series, and NASCAR Whelen All-American Series.
Heim made his ARCA Menards Series debut in 2019 with Chad Bryant Racing, scoring a top-five at Five Flags Speedway on debut. He joined Venturini Motorsports in 2020 and claimed his first ARCA victory at Kansas Speedway in October. In 2021, running the full season with Venturini in the No. 20, he won at Daytona and accumulated further wins at Talladega, Pocono, Elko, Watkins Glen, and Illinois, finishing second in championship behind Ty Gibbs by 37 points.
Heim debuted in the Truck Series in May 2021 for Kyle Busch Motorsports at Darlington. In 2022 he returned to KBM for fifteen races, winning at Atlanta with a last-lap pass of teammate Chandler Smith — his first Truck Series victory at his home track — and again at Gateway, earning the 2022 Camping World Truck Series Rookie of the Year award.
From the 2023 season he drove full-time for Tricon Garage, the rebranded successor to David Gilliland Racing following a move to Toyota Racing Development. In 2023 he won the regular season championship and reached the Championship 4, finishing fourth overall after a post-race penalty at Phoenix. In 2024 he accumulated wins at COTA, Kansas, North Wilkesboro, Gateway, and Pocono during the regular season and won at Kansas again in the playoffs, finishing second in points.
The 2025 season was Heim's championship year. He opened with a win at Daytona (following a competitor's disqualification) and added wins at Las Vegas, Texas, Charlotte, Lime Rock, Watkins Glen, Richmond, Darlington, New Hampshire, Charlotte Roval, and Martinsville before clinching the title at Phoenix. His twelve wins shattered Greg Biffle's previous single-season record of nine set in 1999. Additional records set that season: most consecutive top-fives in a single season (nine), most laps led in a season (1,627), most stage wins in a season (23), and the first driver in the top three NASCAR national series to lead a lap in every race of a single season.
Heim made his Xfinity debut at Dover in 2023 for Sam Hunt Racing, returning for a part-time schedule in 2024 with three top-five and four top-ten finishes across thirteen races in the No. 26.
Heim was announced as a reserve and simulator driver for Legacy Motor Club and 23XI Racing in January 2024, making his Cup debut as Erik Jones's substitute at Dover (25th) and also running the No. 43 at Kansas. In February 2025 he signed a multi-year deal with 23XI Racing as development driver, running a partial schedule in the No. 67 Toyota. He earned his first Cup top-ten at Bristol Motor Speedway with a sixth-place finish despite starting 38th. In 2026 he continued the partial schedule, leading 69 laps at Texas before a late-race spin dropped him to 31st.
Heim holds the record as the youngest driver to reach ten career Truck Series wins (age 22 years and 7 days). His 2025 season produced the most wins, most consecutive top-fives, most stage wins, and most laps led in a single Truck Series season.
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