My teacher had a 396 BB in a Nova drag car he had ( street legal tho ), just got the motor finished, with a forged rotating assembly. had it for about a week when he wanted to go just a bit faster, and blew it up, right after that, he put the factory 6cyl back in it and turned it into a shop vehicle, for the shop he owned at the time, still registered to him, it had the shop name and they did small road service calls with it ( jump starts, tire changes ect... )