Many years ago when I was just learning, someone told me that if I want to make it live I needed to go with a 400 block with aluminum caps and no girdle. So I tried it, and made 9 second passes for about 7 years, then ran that same type of combo in another 9 second car for 5 years. Everyone has their own opinions, I'm just telling you what worked for me. I don't know why, but all my friends that have blown up their motors over the years, have all been RB blocks. But alot of guys here on Moparts run them every weekend.