Technical can't find this small block Chevy suffix code in any literature

Trying to identify this thing...
to52511c

 

What's the number on the back of the block?

 

You sure that's not HC?

If it is it's either a 1965 327 Power Glide (275 hp) or 1969 350 M/T (250 hp).

You can cross check with casting date code.

It has partial Vin code which some say started in '68

 

All of the T_ series were 1978 Pontiacs and 307 motors. My book has 12 different T_ two letter suffixs but none are TO.

 

HC 65-68 327

 

What's the cast # on back of block?

 

69 last year for 327 , a Large Journal
To March 69 I believe , then start of 307

 

Last 2 letters look like HC , that would be 1965 327 ,4 bbl .

 

I'll look for the block casting number, but it's gotta be earlier than 69, has a cannister oil filter...