However, the Boss 429 block has a unique engine block casting with screw-in freeze plugs. With its mission rooted in winning NASCAR races, the Boss 429 was fitted with cylinder heads sporting free ...

The violations come under two sections in the rule book that says “will be long block sealed by NASCAR and must be completely inspected by NASCAR before the engine may be disassembled by the team.

The rule Denny Hamlin violated, which TRD took responsibility for, reads as follows: all race-winning engines “will be long ...

And that’s a pathway that could make sense for NASCAR. “The enemy is not the internal combustion engine. The enemy is carbon,” David Wilson group vice president and president of Toyota ...