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The D code is probably for the engine shipping/ machining date.The block appears to be pre '68 since that was about the time the 427 service blocks started appearing with the reinforcing ribs externally like the other FE's. This doesn't appear to have the ribs. The rods are 428SCJ, observe the shortened head on the bolts (also the part #).
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WDZ
Last edited by Woodz428; 10-13-2003 at 09:37 PM..
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