over the weekend while at a car show, a guy parked next to me in a very healthy sounding 67 camaro. Once he got done wiping his car down, I proceded to ask him what he had done to his 454? He went on to say it really wasn't a 454 but a 548 with 13:1 compression that he drove about 60 miles one way he claimed this was out of a production 454 block. I really don't know a whole lot about big blocks but it seems like a lot of cubes to stretch out of a production block. I did however see a kit for a 548ci in the Doug Herbert book?