Les had found a 351 Cleveland for sale and we bought it for $300. Supposedly had been rebuilt and came as extra motor with the guys Pantera. We pulled a valve cover and it looked rebuilt and still had assembly lube showing. Took it apart and found out it was a Boss 351, 4-bolt main, Boss Crank, boss rods,but with milder pistons and 4V heads. Standard bore! We pulled it apart and went through it and had it checked out, cleaned and gone through. Block is ready!