Mopar drag racers in the early sixties had success with the 413 and 426 __________.

The 413 and 426 engines that brought Mopar significant success in drag racing during the early 1960s were known for being "not-Hemi." While the 426 Hemi is one of the most recognized and celebrated engines in the Mopar lineup, it was the non-Hemi versions that dominated in various competitive contexts at that time. The performance characteristics and specifications of these engines gave them a competitive edge on the drag strip, making them highly effective for the type of racing prevalent in that era.

In contrast, supercharging and turbocharging were not as prevalent or practical in drag racing applications during the early '60s, particularly with Mopar's main offerings at that time. Additionally, the emphasis was often on naturally aspirated engines, with the non-Hemi versions showcasing uniformity and reliability that were prized by racers. This highlights the significance of the non-Hemi designation as a key to understanding the performance successes of Mopar drag racers during that period.