Additional SD casting date info, FWIW . . .
Casting dates on my recently sold my '74 Y8 (M40) SD block and intake, and the heads I still have:
Block: C294
Intake: E134
Heads: F163 and F233
Those I trust can PM or e-mail me for block VIN and EUN if you like.
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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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