What AG said. Patt Lobb is a big 409 guy(also owns a big Toyota dealership above Dallas in Allen). He has a conference table size blueprints of the 409 blocks and it has table for them what letter is for what bore size piston. And hence the term "fitted block" for factory blocks.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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