That's a mighty tight time from block cast to build date, though possible, at least in theory.
oPh and Mike Ransom need to chime in on this one. Mike has a '70 455 GTO so he should be able to provide some additional insight.
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Regards,
"455HO" Lloyd
2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98
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