1970 LS6 450HP SHORT BLOCK 3963512 4- BOLT ORIGINAL CE OR CRV CRR STAMPED

I have a standard boreChevelle LS6 block, also used by GM for L88 Corvette or or COPO 427 factory 4-bolt block, STANDARD BORE. Has what is believed to be GM's original CE stamping still on pad. Standard bore but can machine to. 030 over, optional.