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I'm looking at a bbc short block that the owner claims is 512 ci. It is supposedly a 1969 mk IV block with stock components (427 crank). Excuse my dumb question, again, but how can he come out with this measurement? In other words how far out is it bored to get this displacement?
 

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Here's what I come up with-

454 Engines 3.760" 4.000" 4.250" 4.500" 4.750" 4.875"
Stock bore = 4.250" 427" 454" 482" 511" 539" 553"
Bored .030" = 4.280" 433" 460" 489" 518" 547" 561"
Bored .060" = 4.310" 439" 467" 496" 525" 554" 569"
Bored .090" = 4.340" 445" 473" 503" 533" 562" 577"
Bored .100" = 4.350" 447" 476" 505" 535" 565" 580"
Bored .125" = 4.375" 452" 481" 511" 541" 571" 586"



502 Engines 3.760" 4.000" 4.250" 4.500" 4.750" 4.875"
Stock bore = 4.468" 472" 502" 533" 564" 596" 611"
Bored .032" = 4.500" 478" 509" 541" 573" 604" 620"
Bored .062" = 4.530" 485" 516" 548" 580" 612" 629"
Bored .092" = 4.560" 491" 523" 555" 588" 621" 637"
 
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