A friend of mine is having problems on his b20 engine it keeps blowing up. It’s meant for drag race it has everything changed inside and out. It only runs up to 2 times then the third run the engine blows he couldn’t reach the final round he only gets up to the qualifying race. It’s running 11 sec on the quarter mile. Anybody ? Or Is this really normal for a race engine? What could be the cause? Thanks.