shepboyrd

The casting number on the block reads 7B19. i know the 7 would make it a 19_7 and the next letter should be the decade but there is no way it is a 1957 engine. I am pretty sure it is an 87 but i dont understand why the second digit is a B and not an E? and yes i am positive i am reading it correctly. If anyone could help me out that would be great. Thanks