NASCAR Block ??

[26Troadster]

maybe not, but all i have gotten and opened up where. i really believe it would stand better as a 4" bore block. i do know that my 305 and 307 don't have a 010 number, but can't remember what the numbers are. i do remember the front passenger pad on the large journal 302 block has a yz in the number, but he said there wasn't anything on it there. i believe he has a block that has been decked.

that is dz not yz, if i remember right yz was a 455 sd pontiac the was in a 75 trans am. the old was showing yesterday.