Thread: 454 2bolt hi-po question

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Hello all, I am new here.. I had a good question that is irritating the ever living hell out of me. Hopefully I can get some good insight and knowledge from you more experienced mechanics.

I am currently rebuilding my 454, Now I checked the casting number through Chevy and the block casting came back as a 1969-1973 block year 454 engine.
I sent my block to a machine shop a few days ago and I had just recently called the shop back, and they told me I actually have a 396 bored .030 over... Now that cant be, because the pistons I pulled out where 454 pistons stamped with a .010 over bore... I was told that some 396 blocks were cast with the same casting number as the 454 in that year range.. But still the piston size and bores just don't add up. Any ideas on whats going on? I personally think the machine shop is trying to pull a quick one on me and swap my block out for some block they had sitting around for ever. Now I did stamp a mark that only I know into a certain place on the block.. But still, Any ideas on the piston and block??