NASCAR issued a series of technical changes in a scheduled rule book update on Friday afternoon that included which tracks would formally utilize the 750-horsepower tapered spacer and language that paves the way for an additional manufacturer.<br>This was previously announced but Bristol Motor Speedway, Darlington Raceway, Dover Motor Speedway, Nashville Superspeedway and World Wide Technology ...<a class='more' href='https://www.motorsport.com/nascar-cup/news/nascar-sets-parameters-for-new-cup-oems-in-rules-update/10776799/?utm_source=RSS&utm_medium=referral&utm_campaign=RSS-ALL&utm_term=News&utm_content=www'>Keep reading</a>