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.80 over 390 = 406==help By gerald - 09/30/2001 1:20:59 AM; IP 205.188.200.27 i have a c6mea 390 block i was told it would bore over it is a 66 gt block but has 428 castings it also has a welded A on the back with the casting -66-427 there is no place to check core shift around here im thankfull for all help ps; i have bought new 80 overs,i have 61 gruved crank 61 hipo rods, cam, rockers , coae-d heads try power intake

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Skip Navigation Links. .80 over 390 = 406==help -- gerald, 09/30/2001  RE: .80 over 390 = 406==help -- Darren, 09/30/2001  RE will a 391 truck block work to bore 80 over ? -- gerald, 09/30/2001  RE: .80 over 390 = 406==help -- Mike McQuesten, 10/01/2001

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