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  1. R

    Stamped plate top front of 351c mean?

    I was told my engine is a 351c out of a 71 Ranchero passenger head has M stamp, driver head no stamp.  There is a plate rivited to block infront of dist. Stamped  R -26A.   48906.  What does the stamp indicate?  What do I have for motor and heads?  Mismatch....?
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