68 block date code

[ray anthony]

Trying to verify 1968 engine block date code on a 427 CID 390 HP. The date code now reads J2068. I thought it should read J208. I thought the year was always the last digit not the last two digits. Thanks for any help you may offer.

[Joe L.]

Re: 68 block date code

ray------

With Tonawanda castings (where all big blocks originally installed in Corvettes were cast), a 2 digit casting date for the year is often used.

[Richard F.]

Re: 68 block date code

The 5439 block in my 68 is dated C78.

[Joe L.]

Re: 68 block date code

Richard-----

Tonawanda blocks are seen both ways. That is with both 1 and 2 character year codes.

[ray anthony]

Re: 68 block date code

To Joe and Richard , Thanks for the quick response, greatly appreciated.